Scroll machinery stepped variable-tooth-height scroll slide way sealing structure

Abstract

A stepped variable-tooth-height vortex plate slide way sealing structure of a vortex machine comprises a tooth top sealing structure and a tooth root slide way structure, the molded line of the tooth top sealing structure is composed of a head arc, a far-side curve, a near-side curve and a tail end curve, and the molded line of the tooth root slide way structure is composed of an upper stopping curve, a lower stopping curve, an inner side curve and an outer side curve; the molded line of the tooth crest sealing structure is controlled by the width of the sealing structure, the minimum wall thickness requirement is met, and a tooth crest sealing groove is determined by the molded line of the tooth crest sealing structure and extension line sections EM and FN of the tooth crest sealing structure. The upper and lower dead centers of the molded line of the tooth root slideway structure are controlled by the molded line of the vortex body, the wall thickness and the width of the sealing structure, the inner and outer curves are controlled by the distance between line segments E 'M and F' N and a point O0 and the width of the sealing structure, the point E 'and the point F' form a tooth crest small arc step curve E 'F', and the O0 is the circle center of the head arc of the tooth crest sealing structure and is also the circle center of the tooth crest arc step curve. The large and small arcs can be meshed and sealed in any angle period.

Description

Technical Field

[0001] The invention belongs to the field of scroll machinery, and in particular relates to a scroll machinery stepped variable-tooth high scroll slideway sealing structure. Background Art

[0002] The step-variable tooth height scroll machine refers to a design in which the scroll tooth height of the scroll plate gradually increases from the center to the outside in a step-like manner. This design is mainly to compensate for the influence of the compressed gas temperature gradually rising from the outside to the center of the scroll plate on the radial clearance between the moving and fixed scroll bodies, thereby improving the performance and efficiency of the compressor.

[0003] The design of step-variable tooth height enables the scroll to compress gas more effectively during rotation, reducing energy loss and improving the efficiency of the compressor. Due to the step-shaped change in the height of the scroll teeth, the scroll is subjected to more uniform force during rotation, reducing vibration and noise and improving the stability of the machine. The design of the scroll machine with step-variable tooth height makes its overall structure more compact, occupies less space, and is easy to install and maintain.

[0004] The working principle of a scroll machine is usually based on the vortex effect, that is, when a fluid or gas is subjected to a rotational motion, a vortex structure will be formed. In a scroll machine, the input energy is converted into a rotational force, thereby driving the compression and transmission of the fluid or gas.

[0005] In order to solve the problem of large force and torque caused by the large diameter of the scroll machinery moving disk under large displacement conditions, a stepped variable tooth high scroll can be used to increase the displacement. The stepped variable tooth high scroll machinery theoretically meshes with the small arc and the large arc within a π cycle at the step to form a seal, but cannot mesh within another π cycle to form a leakage. The leakage path is rectangular in the non-meshing area, and its length changes from 0 to the diameter of the large arc, and the width is the step height. The periodically changing leakage path leads to the connection between the two chambers of the compressor, which reduces the volumetric efficiency of the compressor. Summary of the invention

[0006] The purpose of the present invention is to provide a scroll machinery stepped variable tooth high scroll slideway sealing structure to address the above-mentioned problems in the prior art, so as to achieve the meshing of the moving and stationary scrolls within a π cycle in the non-meshing area, and theoretically no leakage area is formed.

[0007] In order to achieve the above object, the present invention has the following technical solutions:

[0008] A stepped variable tooth height scroll slideway sealing structure of a scroll machine comprises a tooth top sealing structure and a tooth root slideway structure, wherein the profile of the tooth top sealing structure is composed of a head circular arc EF, a distal curve EG, a proximal curve FH and a tail end curve GH, and the profile of the tooth root slideway structure is composed of an upper stop curve AB, a lower stop curve CD, an inner curve BC and an outer curve AD; the profile of the tooth top sealing structure is controlled by the width of the sealing structure and meets the minimum wall thickness requirement at the same time, and the corresponding tooth top sealing groove is determined by the profile of the tooth top sealing structure and its extended line segments EM and FN; the upper and lower stop points of the profile of the tooth root slideway structure are controlled by the profile of the scroll body, the wall thickness and the width of the sealing structure, the inner and outer curves are controlled by the distance between the line segments E'M, F'N and a point O0 and the width of the sealing structure, and a variable tooth height tooth top small circular arc step curve E'F' is formed by point E' and point F', and O0 is the center of the head circular arc EF of the tooth top sealing structure and is also the center of the variable tooth height tooth top circular arc step curve E'F'.

[0009] As a preferred solution, the variable tooth height addendum arc step curve E'F' is solved by the following expression:

[0010]

[0011] In the formula, (x i_E' ,y i_E' ) is the horizontal and vertical coordinates of the inner profile line of the scroll tooth tip step curve, (x cr_E'F' ,y cr_E'F' ) is the horizontal and vertical coordinates of the variable tooth height small arc step curve E'F', (x o_F' ,y o_F' ) is the horizontal and vertical coordinates of the outer profile of the scroll tooth tip step curve; a is the base circle radius, α is the base circle angle, φ i_d is the inner profile angle of the scroll tooth tip step curve, φ cr_i_E' is the starting angle of the inner profile of the small arc step curve at the tooth top with variable tooth height, φ o_d is the outer profile angle of the scroll tooth tip step curve, φ cr_o_F' is the starting angle of the outer profile of the small arc step curve at the tooth top with variable tooth height, φ E is the final expansion angle of the involute of the center plane of the vortex disk, (x cr_o_1 ,y cr_o_1 ) is the starting horizontal and vertical coordinates of the small arc step curve of the variable tooth height, θ cr_1 is the center plane angle of the small arc step curve of the variable tooth height, θ cr_o_E' ,θ cr_i_F' are the starting angle and the final angle of the center plane of the small arc step curve with variable tooth height; the step seal structure width b, the step seal structure height h and the step seal structure center length l satisfy the following relationship:

[0012]

[0013] Where h0 is the height of the small arc step at the top of the variable tooth height, φ oi_H ,φ oi_F They are the expansion angles corresponding to point H and point F respectively.

[0014] As a preferred solution, the profile of the tooth tip seal structure is solved by the following expression:

[0015]

[0016] In the formula, (x E_G ,y E_G ) is the horizontal and vertical coordinates of the point on the far side curve EG segment, (x cr_EF ,y cr_EF ) is the horizontal and vertical coordinates of the point on the head arc segment EF, (x F_H ,y F_H ) is the horizontal and vertical coordinates of the point on the FH segment of the near side curve, k is the slope of the coordinate change, (x G_H ,y G_H ) is the horizontal and vertical coordinates of the point on the tail curve GH segment, (x G ,y G ) is the coordinate of point G on the tail curve GH segment, (x H ,y H ) is the coordinate of point H on the tail curve GH segment.

[0017] As a preferred solution, the profile extension segments EM, FN and MN of the tooth tip seal structure are solved by the following expressions:

[0018]

[0019] In the formula, (x E_M ,y E_M ) is the horizontal and vertical coordinates of the point on the EM segment, (x cr_MN ,y cr_MN ) is the horizontal and vertical coordinates of the point on the MN segment. The MN segment coincides with the E'F' part of the small arc step curve with variable tooth height. (x F_N ,y F_N ) are the horizontal and vertical coordinates of the points on the FN segment; φ oi is the profile angle corresponding to the MN segment on the variable tooth height small arc step curve E'F'; φ oi_M ,φ oi_E ,φ oi_N ,φ oi_F are the expansion angles corresponding to points M, E, N, and F on the small arc step curve E'F' of the variable tooth height, θ cr_1 is the center plane angle of the MN segment, θ cr_N ,θ cr_M are the starting angle and final angle of the center plane of the MN segment respectively.

[0020] As a preferred solution, the tooth root step curve A'D' is solved by the following expression:

[0021]

[0022] In the formula, (x i_A' ,y i_A' ) is the horizontal and vertical coordinates of the inner profile line of the turbine tooth root step curve, (x cR_A'D' ,y cR_A'D' ) is the horizontal and vertical coordinates of the variable tooth root large arc step curve A'D', (x o_D' ,y o_D' ) is the horizontal and vertical coordinates of the outer profile of the scroll tooth root step curve, φ i_g is the inner profile angle of the turbine tooth root step curve, φ cR_i_D' is the starting angle of the inner profile of the large arc step curve of the variable tooth height tooth root, φ o_g is the outer profile angle of the turbine tooth root step curve, φ cR_o_A' is the starting angle of the outer profile of the large arc step curve at the root of the variable tooth height, (x cR_o_1 ,y cR_o_1 ) is the starting horizontal and vertical coordinates of the variable tooth root large arc step curve, θ cR_1 is the center plane angle of the large arc step curve of the variable tooth height root, θ cR_o_A' ,θ cR_i_D' They are the starting angle and final angle of the center plane of the large arc step curve of the variable tooth height root.

[0023] As a preferred solution, the outer curve AD of the tooth root slideway structure is related to the line segments EM, MN, and NF of the tooth top seal groove profile line. The intersection of the line segment EM or FN and the radial direction is obtained by the distance between the variable tooth height tooth top arc step curve E'F' and the line segments EM and FN in the radial direction. The intersection of the line segment EM and the line connecting the center O0 and the meshing point is calculated according to the following expression:

[0024]

[0025] In the formula, (x E'M_O ,y E'M_O ) is the horizontal and vertical coordinates of the intersection point on the curve A'D' when the small arc step curve E'M segment of the tooth top and the large arc step curve A'D' segment of the tooth root are meshed, (x E'M ,y E'M ) is the horizontal and vertical coordinates of the E'M segment on the variable tooth height small arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center point O of the large arc step curve of the tooth root, (x E_M ,y E_M) are the horizontal and vertical coordinates of the intersection of EM, O0 and the line connecting the meshing point;

[0026] The intersection of FN, the center of the circle O0 and the line connecting the meshing points is solved by the following expression:

[0027]

[0028] In the formula, (x F'N_O ,y F'N_O ) is the horizontal and vertical coordinates of the intersection point on the curve A'D' when the small arc step curve F'N segment of the tooth top and the large arc step curve A'D' segment of the tooth root are meshed, (x F'N ,y F'N ) is the horizontal and vertical coordinates of the F'N segment on the variable tooth height small arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center point O of the large arc step curve of the tooth root, (x F_N ,y F_N ) are the horizontal and vertical coordinates of the intersection of FN, the center O0 and the line connecting the meshing point.

[0029] As a preferred solution, assuming that point p is the intersection point when the small arc step curve of the tooth top and the large arc step curve of the tooth root are meshed, the distance between the intersection point p and the outer curve AD of the tooth root slideway structure is solved according to the following expression:

[0030]

[0031] In the formula, l E'M_O1 is the distance from the intersection point p when E'M and A'D' mesh to the outer curve of the slideway, l MN is the distance between the intersection point p when MN and A'D' mesh and the outer curve of the slideway, l NF'_O1 is the distance from the intersection point p when NF' and A'D' mesh to the outer curve of the slideway; (x p_E'M ,y p_E'M ) is the horizontal and vertical coordinates of the intersection point p when E'M and A'D' mesh,

[0032] (x p_NF' ,y p_NF' ) is the horizontal and vertical coordinates of the intersection point p when NF' and A'D' are meshed; θ is the center plane angle of the stepped variable tooth high scroll, θ E' ,θ M ,θ N ,θ F' are the angular parameters corresponding to points E', M, N, and F' respectively;

[0033]

[0034] In the formula, (x p ,yp ) is the horizontal and vertical coordinates of point p, (x cr_o ,y cr_o ) are the horizontal and vertical coordinates of the great arc step curve of the tooth root;

[0035] The outer curve AD is composed of three curves, namely curves AM', M'N', and N'D, which can be solved by the following expression:

[0036]

[0037] In the formula, (x AM' ,y AM' ) is the horizontal and vertical coordinates of the point on the outer curve AM' segment, (x M'N' ,y M'N' ) is the horizontal and vertical coordinates of the point on the outer curve M'N' segment, (x N'D ,y N'D ) are the horizontal and vertical coordinates of the points on the outer curve N'D segment.

[0038] As a preferred solution, the inner curve of the tooth root slideway structure is obtained by moving the outer curve inward at a distance equidistant from the seal width; wherein, given the k-stage tooth height and the angular position of the step arc, the profile of the tooth top sealing structure and the tooth root slideway structure at each step is obtained.

[0039] As a preferred solution, the slideway sealing structure is composed of a sealing member and a wear-resistant gravity member. The sealing member has the same profile as the tooth top sealing structure. The weight of the wear-resistant gravity member is higher than that of the sealing member, and the following relationship that the gravity or rotational inertia force is greater than the friction force is satisfied:

[0040] mgcosθ t >μF N

[0041] In the formula, m is the mass of the wear-resistant gravity part, g is the acceleration of gravity, θ t is the angle between the gravity direction and the y-axis, μ is the friction coefficient between the wear-resistant gravity part and the scroll slideway groove, F N It is the positive pressure of the wear-resistant gravity parts.

[0042] As a preferred solution, the seal of the slideway sealing structure and the wear-resistant gravity part are assembled in the form of threaded pins, pin sleeves or dumbbell-shaped structures; the wear-resistant gravity part and the tooth root slideway structure are both treated for wear resistance to reduce surface roughness and prevent jamming at the upper dead point or lower dead point of the tooth root slideway structure, and a seal maximum extension limit mechanism is provided at the seal.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] At present, the commonly used stepped variable tooth high scroll machinery has a small arc and a large arc that theoretically mesh with each other within a π period at the step to form a seal, but they cannot mesh with each other within another π period to form leakage, which reduces the thermal performance of the scroll machinery. The stepped variable tooth high scroll slideway sealing structure of the scroll machinery of the present invention includes a tooth top sealing structure and a tooth root slideway structure. The profile of the tooth top sealing structure is controlled by the width of the sealing structure and meets the minimum wall thickness requirement at the same time. The corresponding tooth top sealing groove is determined by the profile of the tooth top sealing structure and its extended line segment. The profile upper and lower dead points of the profile of the tooth root slideway structure are controlled by the profile of the scroll body, the wall thickness and the width of the sealing structure, which can ensure the meshing of the dynamic and static scrolls within the π period of the non-meshing area, and ensure the complete sealing at the step within the 2π period of the scroll motion. Theoretically, no leakage area is formed to prevent leakage between the compression chamber stages. The scroll machinery can adopt the stepped variable tooth high scroll slideway sealing structure of the present invention to achieve meshing and sealing of large and small arcs within any angle period, thereby improving the thermal performance of the scroll machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Schematic diagram of the seal structure of the stepped variable-tooth high scroll slideway of the scroll machinery according to the embodiment of the present invention;

[0046] Figure 2 A partial enlarged view of the sealing structure of the stepped variable-tooth high scroll slideway of the scroll machinery according to an embodiment of the present invention;

[0047] Figure 3 Schematic diagram of meshing seal at different angles of the stepped variable-tooth high scroll slideway seal structure of the scroll machinery according to the embodiment of the present invention;

[0048] FIG4( a ) is a schematic diagram of a dumbbell-shaped structure nested assembly between a sealing member and a wear-resistant gravity member according to an embodiment of the present invention;

[0049] FIG4( b ) is a schematic diagram of the sealing member and the wear-resistant gravity member being assembled with threaded pins according to an embodiment of the present invention;

[0050] FIG. 4( c ) is a schematic diagram of the pin-sleeve assembly between the seal and the wear-resistant gravity member according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0052] When the stepped variable tooth high scroll machine is in operation, the small arc and the large arc at the step will theoretically mesh in a certain cycle, thus forming an effective seal. However, the problem is that in other cycles, the two arcs cannot mesh, resulting in leakage. This leakage phenomenon will directly affect the thermal performance of the scroll machine.

[0053] Step-variable tooth height is a design method in scroll machinery, which aims to optimize the performance of the machinery by changing the height of the teeth. In this design, the height of the teeth is not fixed, but changes according to a certain rule to form a step shape.

[0054] In certain cycles, the small arc and the large arc can mesh perfectly together to form a tight seal. This meshing is theoretical, meaning that ideally, there will be no gap or leakage between them. However, in other cycles, the small arc and the large arc cannot mesh. This will cause leakage inside the scroll machine during these cycles, affecting its thermal performance. Leakage will reduce the efficiency of the scroll machine. Leakage will also increase the energy loss of the machine, thereby reducing its overall thermal performance. Therefore, the design of the stepped tooth height needs to be further optimized.

[0055] See also Figure 1 In order to ensure the meshing of the moving and stationary scrolls within a period of π in the non-meshing area, an embodiment of the present invention proposes a scroll machinery stepped variable tooth height scroll slideway sealing structure, including a complete sealing structure at the step within a period of 2π for the scroll motion, which is composed of a tooth top sealing structure and a tooth root slideway structure. The sealing mechanism of the embodiment of the present invention ensures full meshing within a period of 2π for the scroll motion, and theoretically no leakage zone is formed. Under the condition of ensuring the meshing of the small arc and the large arc, the wear-resistant gravity part at the head of the sealing structure meshes with the slideway curve, and the meshing process considers the influence of the sealing groove and the thickness of the tooth top scroll in sections, thereby solving the step leakage problem of the stepped variable tooth height during the motion process, and can effectively improve the efficiency of the compressor.

[0056] See also Figure 2 The profile of the tooth tip seal structure of the embodiment of the present invention is composed of the head arc EF, the distal curve EG, the proximal curve FH and the tail curve GH, and the profile of the tooth root slideway structure is composed of the upper stop curve AB, the lower stop curve CD, the inner curve BC and the outer curve AD. The profile of the tooth tip seal structure is controlled by the width of the seal structure and meets the minimum wall thickness requirement, which is not less than The thickness of the scroll disk and the corresponding tooth top seal groove are determined by the profile of the tooth top seal structure and its extended line segments EM and FN; the upper and lower dead points of the profile of the tooth root slideway structure are controlled by the profile of the scroll body, the wall thickness and the width of the seal structure. The inner and outer curves are controlled by the distance between the line segments E'M, F'N and point O0 and the width of the seal structure. The variable tooth height tooth top small arc step curve E'F' is formed by points E' and F'. O0 is the center of the head arc EF of the tooth top seal structure, and is also the center of the variable tooth height tooth top arc step curve E'F'. O1 is the center of the upper stop curve AB; O2 is the center of the lower stop curve CD.

[0057] In a possible implementation manner, the variable tooth height addendum arc step curve E'F' is solved by the following expression:

[0058]

[0059] In the formula, (x i_E' ,y i_E' ) is the horizontal and vertical coordinates of the inner profile line of the scroll tooth tip step curve, (x cr_E'F' ,y cr_E'F' ) is the horizontal and vertical coordinates of the variable tooth height small arc step curve E'F', (x o_F' ,y o_F' ) is the horizontal and vertical coordinates of the outer profile of the scroll tooth top step curve. a is the base circle radius, 2.2798mm; α is the base circle angle, 0.7557rad; φ i_d is the inner profile angle of the step curve at the top of the scroll tooth, 3π; φ cr_i_E' is the starting angle of the inner profile of the small arc step curve of the variable tooth height, 11.8106rad; φ o_d is the outer profile angle of the scroll tooth tip step curve; φ cr_o_F' The starting angle of the outer profile of the small arc step curve of the variable tooth height tooth top is 13.3221rad; φ E is the final angle of the involute of the center plane of the vortex disk, 5.9π. (x cr_o_1 ,y cr_o_1 ) is the starting horizontal and vertical coordinates of the small arc step curve of the variable tooth height, θ cr_1 is the center plane angle of the small arc step curve of the variable tooth height, θ cr_o_E' ,θ cr_i_F′ They are the starting angle and final angle of the center plane of the small arc step curve with variable tooth height.

[0060] The width b of the step seal structure is 1.846 mm; the height h of the step seal structure is 10 mm; the center length l of the step seal structure is 20 mm; and the following relationship is satisfied:

[0061]

[0062] Where, h0 is the height of the small arc step at the top of the variable tooth height, 8mm; φ oi_H ,φ oi_F They are the expansion angles corresponding to points H and F of the stepped sealing structure respectively.

[0063] The profile GEFH of the tooth tip seal structure is solved by the following expression:

[0064]

[0065] In the formula, (x E_G ,y E_G ) is the horizontal and vertical coordinates of the point on the far side curve EG segment, (x cr_EF ,y cr_EF) is the horizontal and vertical coordinates of the point on the head arc segment EF, (x F_H ,y F_H ) is the horizontal and vertical coordinates of the point on the FH segment of the near side curve, k is the slope of the coordinate change, (x G_H ,y G_H ) is the horizontal and vertical coordinates of the point on the tail curve GH segment, (x G ,y G ) is the coordinate of point G on the tail curve GH segment, (x H ,y H ) is the coordinate of point H on the tail curve GH segment.

[0066] The extended line segments EM, FN and MN of the tooth tip seal structure are solved by the following expressions:

[0067]

[0068] In the formula, (x E_M ,y E_M ) is the horizontal and vertical coordinates of the point on the EM segment, (x cr_MN ,y cr_MN ) is the horizontal and vertical coordinates of the point on the MN segment. The MN segment coincides with the E'F' part of the small arc step curve with variable tooth height. (x F_N ,y F_N ) are the horizontal and vertical coordinates of the points on the FN segment; φ oi is the profile angle corresponding to the MN segment on the variable tooth height small arc step curve E'F'; φ oi_M ,φ oi_E ,φ oi_N ,φ oi_F are the expansion angles corresponding to points M, E, N, and F on the small arc step curve E'F' of the variable tooth height, θ cr_1 is the center plane angle of the MN segment, θ cr_N ,θ cr_M are the starting angle and final angle of the center plane of the MN segment respectively.

[0069] The tooth root step curve A'D' is solved by the following expression:

[0070]

[0071] In the formula, (x i_A' ,y i_A' ) is the horizontal and vertical coordinates of the inner profile line of the turbine tooth root step curve, (x cR_A'D' ,y cR_A'D' ) is the horizontal and vertical coordinates of the variable tooth root large arc step curve A'D', (x o_D' ,y o_D' ) is the horizontal and vertical coordinates of the outer profile of the scroll tooth root step curve, φ i_g is the inner profile angle of the turbine tooth root step curve, φcR_i_D' is the starting angle of the inner profile of the large arc step curve of the variable tooth height tooth root, φ o_g is the outer profile angle of the turbine tooth root step curve, φ cR_o_A' is the starting angle of the outer profile of the large arc step curve at the root of the variable tooth height, (x cR_o_1 ,y cR_o_1 ) is the starting horizontal and vertical coordinates of the variable tooth root large arc step curve, θ cR_1 is the center plane angle of the large arc step curve of the variable tooth height root, θ cR_o_A' ,θ cR_i_D' They are the starting angle and final angle of the center plane of the large arc step curve of the variable tooth height root.

[0072] The outer curve AD of the tooth root slideway structure is related to the line segments EM, MN, and NF of the tooth top seal groove line. The distance between the variable tooth height tooth top arc step curve E'F' and the line segments EM and FN along the radial direction is used to obtain the intersection of the line segment EM or FN and the radial direction. The intersection of the line segment EM and the center O0 and the meshing point is calculated according to the following expression:

[0073]

[0074] In the formula, (x E'M_O ,y E′M_O ) is the horizontal and vertical coordinates of the intersection point on the curve A'D' when the small arc step curve E'M segment of the tooth top and the large arc step curve A'D' segment of the tooth root are meshed, (x E'M ,y E′M ) is the horizontal and vertical coordinates of the E'M segment on the variable tooth height small arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center point O of the large arc step curve of the tooth root, (x E_M ,y E_M ) are the horizontal and vertical coordinates of the intersection of EM, O0 and the line connecting the meshing point;

[0075] The intersection of FN, the center of the circle O0 and the line connecting the meshing points is solved by the following expression:

[0076]

[0077] In the formula, (x F′N_O ,y F′N_O ) is the horizontal and vertical coordinates of the intersection point on the curve A'D' when the small arc step curve F'N segment of the tooth top and the large arc step curve A'D' segment of the tooth root are meshed, (x F′N ,y F′N ) is the horizontal and vertical coordinates of the F'N segment on the variable tooth height small arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center point O of the large arc step curve of the tooth root, (xF_N ,y F_N ) are the horizontal and vertical coordinates of the intersection of FN, the center O0 and the line connecting the meshing point.

[0078] Assuming that point p is the intersection point of the tooth top small arc step curve and the tooth root large arc step curve meshing, the distance between the intersection point p and the outer curve AD of the tooth root slideway structure is solved according to the following expression:

[0079]

[0080] In the formula, is the distance from the intersection point p when E'M and A'D' mesh to the outer curve of the slideway, l MN is the distance between the intersection point p when MN and A′D' mesh and the outer curve of the slideway, is the distance from the intersection point p when NF' and A'D' mesh to the outer curve of the slideway; (x p_E′M ,y p_E′M ) is the horizontal and vertical coordinates of the intersection point p when E'M and A'D' mesh, (x p_NF′ ,y p_NF' ) is the horizontal and vertical coordinates of the intersection point p when NF' and A'D' are meshed; θ is the center plane angle of the stepped variable tooth high scroll, θ E′ ,θ M ,θ N ,θ F′ are the angular parameters corresponding to points E', M, N, and F' respectively;

[0081]

[0082] In the formula, (x p ,y p ) is the horizontal and vertical coordinates of point p, (x cr_o ,y cr_o ) are the horizontal and vertical coordinates of the great arc step curve of the tooth root;

[0083] The outer curve AD is composed of three curves, namely curves AM', M'N', and N'D, which can be solved by the following expression:

[0084]

[0085] In the formula, (x AM′ ,y AM′ ) is the horizontal and vertical coordinates of the point on the outer curve AM' segment, (x M′N′ ,y M′N′ ) is the horizontal and vertical coordinates of the point on the outer curve M'N' segment, (x N'D ,y N′D ) are the horizontal and vertical coordinates of the points on the outer curve N'D segment.

[0086] The inner curve of the tooth root slideway structure is obtained by the distance of the outer curve inwardly equidistant from the seal width. The parameters required for the large and small arcs can be obtained by giving the k-stage tooth height and the angle position of the step arc, and the sealing curve and slideway curve at each step are obtained by the above method. The outer curve of the slideway is the limit position curve, and the curves AM′ and N′D can be moved inward, but the first-order continuity of the curve should be guaranteed and it will not get stuck during the movement process.

[0087] See also Figure 3 At different angles, the small arc and the stepped sealing structure can mesh with the large arc to form a complete seal. The slideway sealing structure is composed of a seal and a wear-resistant gravity member. The seal has the same profile as the tooth top sealing structure. The wear-resistant gravity member is heavier than the seal and satisfies the following relationship that gravity or rotational inertia force is greater than friction force:

[0088] mgcosθ t >μF N

[0089] In the formula, m is the mass of the wear-resistant gravity part, g is the acceleration of gravity, θ t is the angle between the gravity direction and the y-axis, μ is the friction coefficient between the wear-resistant gravity part and the scroll slideway groove, F N It is the positive pressure of the wear-resistant gravity parts.

[0090] Please refer to FIG. 4 (a), FIG. 4 (b) and FIG. 4 (c). The seal of the slideway seal structure and the wear-resistant gravity member are assembled in the form of threaded pins, pin sleeves or dumbbell-shaped structure nesting.

[0091] The wear-resistant gravity member and the tooth root slideway structure are both subjected to wear-resistant treatment to reduce surface roughness and prevent jamming at the upper dead point or the lower dead point of the tooth root slideway structure. A seal maximum extension limit mechanism is provided at the seal.

[0092] The stepped sealing structure produced by the design method of the present invention can realize the meshing of the small arc and the large arc to form a seal within any angular period, thereby preventing leakage between compression chamber stages and improving the thermal performance of the scroll machinery.

[0093] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and therefore should be included in the protection scope of the present application.

Claims

1. A scroll machine stepped variable tooth high scroll slideway sealing structure, characterized in that: It includes a tooth top sealing structure and a tooth root slideway structure, the profile of the tooth top sealing structure is composed of a head arc EF, a distal curve EG, a proximal curve FH and a tail end curve GH, and the profile of the tooth root slideway structure is composed of an upper stop curve AB, a lower stop curve CD, an inner curve BC and an outer curve AD; the profile of the tooth top sealing structure is controlled by the width of the sealing structure and meets the minimum wall thickness requirement at the same time, and the corresponding tooth top sealing groove is determined by the profile of the tooth top sealing structure and its extended line segments EM and FN; the upper and lower dead points of the profile of the tooth root slideway structure are controlled by the vortex body profile, wall thickness and sealing structure width, the inner and outer curves are controlled by the distance between the line segments E'M, F'N and the point O0 and the sealing structure width, and the variable tooth height tooth top small arc step curve E'F' is formed by point E' and point F', O0 is the center of the head arc EF of the tooth top sealing structure, and is also the center of the variable tooth height tooth top arc step curve E'F'.

2. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: The variable tooth height addendum arc step curve E'F' is solved by the following expression: In the formula, (x i_E' ,y i_E' ) is the horizontal and vertical coordinates of the inner profile line of the scroll tooth tip step curve, (x cr_E'F' ,y cr_E'F' ) is the horizontal and vertical coordinates of the variable tooth height small arc step curve E'F', (x o_F' ,y o_F' ) is the horizontal and vertical coordinates of the outer profile of the scroll tooth tip step curve; a is the base circle radius, α is the base circle angle, φ i_d is the inner profile angle of the scroll tooth tip step curve, φ cr_i_E' is the starting angle of the inner profile of the small arc step curve at the tooth top with variable tooth height, φ o_d is the outer profile angle of the scroll tooth tip step curve, φ cr_o_F' is the starting angle of the outer profile of the small arc step curve at the tooth top with variable tooth height, φ E is the final expansion angle of the involute of the center plane of the vortex disk, (x cr_o_1 ,y cr_o_1 ) is the starting horizontal and vertical coordinates of the small arc step curve of the variable tooth height, θ cr_1 is the center plane angle of the small arc step curve of the variable tooth height, θ cr_o_E' ,θ cr_i_F' are the starting angle and the final angle of the center plane of the small arc step curve with variable tooth height; the step seal structure width b, the step seal structure height h and the step seal structure center length l satisfy the following relationship: Where h0 is the height of the small arc step at the top of the variable tooth height, φ oi_H ,φ oi_F They are the expansion angles corresponding to point H and point F respectively.

3. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 2, characterized in that: The profile of the tooth tip seal structure is solved by the following expression: In the formula, (x E_G ,y E_G ) is the horizontal and vertical coordinates of the point on the far side curve EG segment, (x cr_EF ,y cr_EF ) is the horizontal and vertical coordinates of the point on the head arc segment EF, (x F_H ,y F_H ) is the horizontal and vertical coordinates of the point on the FH segment of the near side curve, k is the slope of the coordinate change, (x G_H ,y G_H ) is the horizontal and vertical coordinates of the point on the tail curve GH segment, (x G ,y G ) is the coordinate of point G on the tail curve GH segment, (x H ,y H ) is the coordinate of point H on the tail curve GH segment.

4. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 3, characterized in that: The profile extension segments EM, FN and MN of the tooth tip seal structure are solved by the following expressions: In the formula, (x E_M ,y E_M ) is the horizontal and vertical coordinates of the point on the EM segment, (x cr_MN ,y cr_MN ) is the horizontal and vertical coordinates of the point on the MN segment. The MN segment coincides with the E'F' part of the small arc step curve with variable tooth height. (x F_N ,y F_N ) are the horizontal and vertical coordinates of the points on the FN segment; φ oi is the profile angle corresponding to the MN segment on the variable tooth height small arc step curve E'F'; φ oi_M ,φ oi_E ,φ oi_N ,φ oi_F are the expansion angles corresponding to points M, E, N, and F on the small arc step curve E'F' of the variable tooth height, θ cr_1 is the center plane angle of the MN segment, θ cr_N ,θ cr_M are the starting angle and final angle of the center plane of the MN segment respectively.

5. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: The tooth root step curve A'D' is solved by the following expression: In the formula, (x i_A' ,y i_A' ) is the horizontal and vertical coordinates of the inner profile line of the turbine tooth root step curve, (x cR_A'D' ,y cR_A'D' ) is the horizontal and vertical coordinates of the variable tooth root large arc step curve A'D', (x o_D' ,y o_D' ) is the horizontal and vertical coordinates of the outer profile of the scroll tooth root step curve, φ i_g is the inner profile angle of the turbine tooth root step curve, φ cR_i_D' is the starting angle of the inner profile of the large arc step curve of the variable tooth height tooth root, φ o_g is the outer profile angle of the turbine tooth root step curve, φ cR_o_A' is the starting angle of the outer profile of the large arc step curve at the root of the variable tooth height, (x cR_o_1 ,y cR_o_1 ) is the starting horizontal and vertical coordinates of the variable tooth root large arc step curve, θ cR_1 is the center plane angle of the large arc step curve of the variable tooth height root, θ cR_o_A' ,θ cR_i_D' They are the starting angle and final angle of the center plane of the large arc step curve of the variable tooth height root.

6. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: The outer curve AD of the tooth root slideway structure is related to the line segments EM, MN, and NF of the tooth top sealing groove profile line. The intersection of the line segment EM or FN and the radial direction is obtained by the distance between the variable tooth height tooth top arc step curve E'F' and the line segments EM and FN in the radial direction. The intersection of the line segment EM and the line connecting the center O0 and the meshing point is calculated according to the following expression: In the formula, (x E'M_O ,y E'M_O ) is the horizontal and vertical coordinates of the intersection point on the curve A'D' when the small arc step curve E'M segment of the tooth top and the large arc step curve A'D' segment of the tooth root are meshed, (x E'M ,y E'M ) is the horizontal and vertical coordinates of the E'M segment on the variable tooth height small arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center point O of the large arc step curve of the tooth root, (x E_M ,y E_M ) are the horizontal and vertical coordinates of the intersection of EM, O0 and the line connecting the meshing point; The intersection of FN, the center of the circle O0 and the line connecting the meshing points is solved by the following expression: In the formula, (x F'N_O ,y F′N_O ) is the horizontal and vertical coordinates of the intersection point on the curve A'D' when the small arc step curve F'N segment of the tooth top and the large arc step curve A'D' segment of the tooth root are meshed, (x F′N ,y F'N ) is the horizontal and vertical coordinates of the F'N segment on the variable tooth height small arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center point O of the large arc step curve of the tooth root, (x F_N ,y F_N ) are the horizontal and vertical coordinates of the intersection of FN, the center O0 and the line connecting the meshing point.

7. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: Assuming that point p is the intersection point of the tooth top small arc step curve and the tooth root large arc step curve meshing, the distance between the intersection point p and the outer curve AD of the tooth root slideway structure is solved according to the following expression: In the formula, is the distance from the intersection point p when E'M and A'D' mesh to the outer curve of the slideway, l MN is the distance between the intersection point p when MN and A′D' mesh and the outer curve of the slideway, is the distance from the intersection point p when NF' and A'D' mesh to the outer curve of the slideway; (x p_E′M ,y p_E′M ) is the horizontal and vertical coordinates of the intersection point p when E'M and A'D' mesh, (x p_NF′ ,y p_NF' ) is the horizontal and vertical coordinates of the intersection point p when NF' and A'D' are meshed; θ is the center plane angle of the stepped variable tooth high scroll, θ E' ,θ M ,θ N ,θ F' are the angular parameters corresponding to points E', M, N, and F' respectively; In the formula, (x p ,y p ) is the horizontal and vertical coordinates of point p, (x cr_o ,y cr_o ) are the horizontal and vertical coordinates of the great arc step curve of the tooth root; The outer curve AD of the tooth root slideway structure is composed of three curves, namely curves AM', M'N', and N'D, which are solved according to the following expression: In the formula, (x AM' ,y AM' ) is the horizontal and vertical coordinates of the point on the outer curve AM' segment, (x M'N' ,y M'N' ) is the horizontal and vertical coordinates of the point on the outer curve M'N' segment, (x N'D ,y N'D ) are the horizontal and vertical coordinates of the points on the outer curve N'D segment.

8. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 7, characterized in that: The inner curve of the tooth root slideway structure is obtained by the distance of the outer curve inwardly equidistant from the seal width; wherein, given the k-stage tooth height and the angular position of the step arc, the profile of the tooth top sealing structure and the tooth root slideway structure at each step is obtained.

9. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: The slideway sealing structure is composed of a sealing member and a wear-resistant gravity member. The sealing member has the same profile as the tooth top sealing structure. The weight of the wear-resistant gravity member is higher than that of the sealing member, and the following relationship is satisfied that the gravity or rotational inertia force is greater than the friction force: mgcosθ t >μF N In the formula, m is the mass of the wear-resistant gravity part, g is the acceleration of gravity, θ t is the angle between the gravity direction and the y-axis, μ is the friction coefficient between the wear-resistant gravity part and the scroll slideway groove, F N It is the positive pressure of the wear-resistant gravity parts.

10. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 9, characterized in that: The seal of the slideway sealing structure and the wear-resistant gravity part are assembled in the form of threaded pins, pin sleeves or dumbbell-shaped structures; the wear-resistant gravity part and the tooth root slideway structure are both treated for wear resistance to reduce surface roughness and prevent jamming at the upper dead point or lower dead point of the tooth root slideway structure, and a seal maximum extension limit mechanism is provided at the seal.

Images