A scroll machinery stepped variable tooth high scroll slideway sealing structure

Abstract

The application discloses a stepped variable tooth height scroll slide sealing structure of a scroll machine, which comprises a tooth top sealing structure and a tooth root slide structure, the profile of the tooth top sealing structure is composed of a head circular arc, a distal curve, a proximal curve and a tail curve, and the profile of the tooth root slide structure is composed of an upper stop curve, a lower stop curve, an inner curve and an outer curve; the profile of the tooth top sealing structure is controlled by a sealing structure width, and the minimum wall thickness requirement is met; the tooth top sealing groove is determined by the profile of the tooth top sealing structure and extension lines EM and FN of the profile; the upper and lower stop points of the profile of the tooth root slide structure are controlled by the profile of a scroll body, a wall thickness and a sealing structure width, the inner and outer curves are controlled by the distance between line segments E'M and F'N and point O0 and the sealing structure width, and points E' and F' form a tooth top small circular arc stepped curve E'F'; O0 is the center of the head circular arc of the tooth top sealing structure and also the center of the tooth top circular arc stepped curve. The application can realize the meshing sealing of large and small circular arcs in an arbitrary angle period.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of scroll machines, and particularly relates to a stepped variable-tooth-height scroll slide sealing structure of a scroll machine. BACKGROUND

[0002] The stepped variable-tooth-height scroll machine refers to a design in which the scroll tooth height of a scroll plate gradually increases in a stepped manner from the center to the outside. This design is mainly to compensate for the influence of the gradual rise of the temperature of compressed gas from the outside to the center of the scroll plate on the radial gap between the moving and stationary scroll bodies, so as to improve the performance and efficiency of the compressor.

[0003] The stepped variable-tooth-height design enables the scroll plate to more effectively compress gas during rotation, reduces energy loss, and improves the efficiency of the compressor. Due to the stepped change in the scroll tooth height, the force on the scroll plate during rotation is more uniform, reducing vibration and noise and improving the stability of the machine. The design of the stepped variable-tooth-height scroll machine makes the overall structure more compact, occupies less space, and is easier to install and maintain.

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

[0005] To solve the problem of excessive force and torque caused by the large diameter of the moving plate of a scroll machine under large displacement, a stepped variable-tooth-height scroll can be used to increase the displacement. The stepped variable-tooth-height scroll machine forms a seal by theoretically meshing the small and large circular arcs at the step in a π period, but cannot mesh to form a leak in another π period. The leakage path in the non-meshing area is rectangular in shape, with a length that changes from 0 to the diameter of the large circular arc and a width that is the step height. The periodically changing leakage path causes the two chambers of the compressor to communicate, reducing the volumetric efficiency of the compressor. SUMMARY

[0006] The purpose of the present application is to solve the problems in the prior art and provide a stepped variable-tooth-height scroll slide sealing structure of a scroll machine, which enables the meshing of the moving and stationary scroll plates in a π period in the non-meshing area and theoretically does not form a leakage area.

[0007] To achieve the above purpose, the present application has the following technical solutions:

[0008] A scroll machinery stepped variable tooth height scroll slideway sealing structure 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 while meeting the minimum wall thickness requirement, 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 scroll body profile, the wall thickness and the 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 circular arc step curve E'F' is formed by points E' and 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 small arc step curve E'F' of the variable tooth height tooth top, (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, 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 top of the 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 tooth top, θ cr_1 is the center plane angle of the small arc step curve with 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] wherein h0 is the height of the tooth top small circular arc step, φ oi_H ,φ oi_F are the corresponding spread angles of points H and F respectively.

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

[0015]

[0016] wherein (x E_G ,y E_G ) are the horizontal and vertical coordinates of the point on the distal curve EG segment, (x cr_EF ,y cr_EF ) are the horizontal and vertical coordinates of the point on the head circular arc EF segment, (x F_H ,y F_H ) are the horizontal and vertical coordinates of the point on the proximal curve FH segment, k is the coordinate change slope, (x G_H ,y G_H ) are the horizontal and vertical coordinates of the point on the tail end curve GH segment, (x G ,y G ) are the coordinates of the G point on the tail end curve GH segment, (x H ,y H ) are the coordinates of the H point on the tail end curve GH segment.

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

[0018]

[0019] wherein (x E_M ,y E_M ) are the horizontal and vertical coordinates of the point on the EM segment, (x cr_MN ,y cr_MN ) are the horizontal and vertical coordinates of the point on the MN segment, which is partially overlapped with the variable tooth height tooth top small circular arc step curve E'F', (x F_N ,y F_N ) are the horizontal and vertical coordinates of the point on the FN segment; φ oi is the profile spread angle corresponding to the MN segment on the variable tooth height tooth top small circular arc step curve E'F'; φ oi_M ,φ oi_E ,φ oi_N ,φ oi_F are the corresponding spread angles of points M, E, N and F on the variable tooth height tooth top small circular arc step curve E'F' respectively, θ cr_1 is the central surface spread angle of the MN segment, θ cr_N ,θ cr_M are the central surface initial angle and final angle 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] wherein (x i_A' ,y i_A' ) is the horizontal and vertical coordinates of the inside profile of the scroll tooth root step curve, (x cR_A'D' ,y cR_A'D' ) is the horizontal and vertical coordinates of the variable tooth height tooth root large circular arc step curve A'D', (x o_D' ,y o_D' ) is the horizontal and vertical coordinates of the outside profile of the scroll tooth root step curve, φ i_g is the development angle of the inside profile of the scroll tooth root step curve, φ cR_i_D' is the initial angle of the inside profile of the variable tooth height tooth root large circular arc step curve, φ o_g is the development angle of the outside profile of the scroll tooth root step curve, φ cR_o_A' is the initial angle of the outside profile of the variable tooth height tooth root large circular arc step curve, (x cR_o_1 ,y cR_o_1 ) is the initial horizontal and vertical coordinates of the variable tooth height tooth root large circular arc step curve, θ cR_1 is the central surface development angle of the variable tooth height tooth root large circular arc step curve, θ cR_o_A' and θ cR_i_D' are the initial and final angles of the central surface of the variable tooth height tooth root large circular arc step curve.

[0023] As a preferred solution, the outside curve AD of the tooth root slide structure is related to the line segments EM, MN and NF of the tip seal groove profile, the intersection of the line segment EM or FN and the radial direction is obtained by the distance of the variable tooth height tip circular arc step curve E'F' from the line segments EM and FN in the radial direction, and 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] wherein (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 E'M segment of the tip small circular arc step curve and the A'D' segment of the tooth root large circular arc step curve mesh, (x E'M ,y E'M ) is the horizontal and vertical coordinates of the E'M segment on the variable tooth height tip small circular arc step curve E'F', (x O ,y O ) is the horizontal and vertical coordinates of the center O point of the tooth root large circular arc step curve, (x E_M ,y E_M) are the horizontal and vertical coordinates of the intersection point of FN and the line connecting O0 and the meshing point;

[0026] FN and the line connecting O0 and the meshing point is solved by the following expression:

[0027]

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

[0029] As a preferred solution, assuming that the point p is the intersection point of the tooth tip small circular arc stepped curve and the tooth root large circular arc stepped curve when they mesh, the distance between the intersection point p and the outer curve AD of the tooth root slide structure is solved according to the following expression:

[0030]

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

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

[0033]

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

[0035] The outer curve AD is composed of three curves, namely curves AM', M'N' and N'D, which are solved according to the following expressions:

[0036]

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

[0038] As a preferred scheme, the inner curve of the tooth root slide structure is obtained by equidistantly sealing the width of the outer curve inward; wherein, given the k-stage tooth height and the angle position of the step circle arc, the profile of the tooth top sealing structure and the tooth root slide structure at each step is obtained.

[0039] As a preferred scheme, the slide sealing structure is composed of a sealing element and a wear-resistant gravity element, the sealing element has the same profile as the tooth top sealing structure, the weight of the wear-resistant gravity element is higher than that of the sealing element, and the following relationship between the gravity or rotational inertia force and the friction force is satisfied:

[0040] mgcosθ t > μF N

[0041] In the formula, m is the mass of the wear-resistant gravity element, g is the acceleration of gravity, θ t is the included angle between the gravity direction and the y-axis, μ is the friction coefficient between the wear-resistant gravity element and the scroll slide groove, and F N is the normal pressure of the wear-resistant gravity element.

[0042] As a preferred scheme, the sealing element and the wear-resistant gravity element of the slide sealing structure are assembled in the form of threaded pins, pin sleeves or dumbbell-shaped structure nesting; the wear-resistant gravity element and the tooth root slide structure are subjected to wear-resistant treatment to reduce the surface roughness, prevent the upper dead center or lower dead center of the tooth root slide structure from being stuck, and a maximum extension limiting mechanism of the sealing element is arranged at the sealing element.

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

[0044] The common step variable tooth height scroll machine currently used is sealed by the theoretical meshing of a small circular arc and a large circular arc in a pi period at the step, but cannot mesh in another pi period to form leakage, thereby reducing the thermal performance of the scroll machine. The step variable tooth height scroll disc slide sealing structure of the scroll machine of the present application comprises a tooth tip sealing structure and a tooth root slide structure, the profile of the tooth tip sealing structure is controlled by the sealing structure width, while meeting the minimum wall thickness requirement, the corresponding tooth tip sealing groove is determined by the profile of the tooth tip sealing structure and the extension line segment thereof, the upper and lower dead centers of the profile of the tooth root slide structure are controlled by the scroll body profile, wall thickness and sealing structure width, the meshing of the moving and stationary scroll discs in the non-meshing area pi period can be ensured, the complete sealing at the step in the 2pi period of scroll movement is ensured, theoretically no leakage area is formed, and inter-stage leakage of the compression chamber is prevented. The step variable tooth height scroll disc slide sealing structure of the present application can be used in the scroll machine to realize the meshing sealing of the large and small circular arcs in any angle period, thereby improving the thermal performance of the scroll machine. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The schematic diagram of the step variable tooth height scroll disc slide sealing structure of the scroll machine of the embodiment of the present application;

[0046] Figure 2 The partial enlarged view of the step variable tooth height scroll disc slide sealing structure of the scroll machine of the embodiment of the present application;

[0047] Figure 3 The schematic diagram of the meshing sealing of the step variable tooth height scroll disc slide sealing structure of the scroll machine of the embodiment of the present application under different angles;

[0048] Fig. 4(a) is a schematic diagram of the nested assembly of the seal and the wear-resistant gravity piece in the embodiment of the present application by adopting a dumbbell type structure;

[0049] Fig. 4(b) is a schematic diagram of the assembly of the seal and the wear-resistant gravity piece in the embodiment of the present application by adopting a threaded pin;

[0050] Fig. 4(c) is a schematic diagram of the assembly of the seal and the wear-resistant gravity piece in the embodiment of the present application by adopting a pin sleeve. DETAILED DESCRIPTION

[0051] The present application will be further described in detail below in combination with the drawings and embodiments.

[0052] When the step variable tooth height scroll machine is in operation, the small circular arc and the large circular arc at the step will theoretically mesh in a certain period, thereby forming an effective sealing. However, the problem is that the two circular arcs cannot mesh in another period, resulting in leakage. This leakage phenomenon will directly affect the reduction of the thermal performance of the scroll machine.

[0053] The stepped tooth height is a design in scroll machines, which aims to optimize the performance of the machine by changing the height of the teeth. In this design, the height of the teeth is not fixed, but varies according to a certain law, forming a stepped shape.

[0054] In some periods, the small and large circular arcs can perfectly mesh together, forming a tight seal. This meshing is theoretical, meaning that in ideal conditions, there will be no gap or leakage between them. However, in some other periods, the small and large circular arcs cannot mesh together. This will cause leakage inside the scroll machine during these periods, affecting its thermal performance. Leakage will cause the scroll machine to work less efficiently. Leakage will also increase the energy loss of the machine, thus reducing its overall thermal performance. Therefore, the design of the stepped tooth height needs to be further optimized.

[0055] Referring to Figure 1 To ensure the meshing of the orbiting scroll and the fixed scroll in the non-meshing area π period, the embodiment of the present application proposes a scroll machine stepped tooth height orbiting scroll slide sealing structure, which includes a complete sealing structure for realizing the scroll motion 2π period at the stepped position, which is composed of a tooth tip sealing structure and a tooth root slide structure. The sealing mechanism of the embodiment of the present application ensures the full meshing of the scroll motion 2π period, theoretically forming no leakage area. Under the condition of ensuring the meshing of the small and large circular arcs, the sealing structure head wear-resistant gravity piece is engaged with the slide curve, and the influence of the sealing groove and the tooth tip scroll thickness is considered in the process of engagement, solving the stepped leakage problem of the stepped tooth height in the movement process, which can effectively improve the efficiency of the compressor.

[0056] Referring to Figure 2 The profile of the tooth tip sealing structure is composed of a head circular arc EF, a distal curve EG, a proximal curve FH, and a tail curve GH. The profile of the tooth root slide 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 tip sealing structure is controlled by the sealing structure width, which meets the minimum wall thickness requirement, not less than The tooth tip sealing groove corresponding to the tooth tip sealing structure is determined by the profile of the tooth tip sealing structure and its extension line segments EM and FN. The upper and lower stop points of the profile of the tooth root slide structure are controlled by the scroll body profile, the wall thickness, and the sealing structure width. The inner and outer curves are controlled by the distance between line segments E'M and F'N and point O0, as well as the sealing structure width. The variable tooth height tooth tip small circular arc stepped curve E'F' is composed of points E' and F'. O0 is the center of the head circular arc EF of the tooth tip sealing structure, which is also the center of the variable tooth height tooth tip circular arc stepped 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 one possible implementation, the variable tooth height tooth tip circular arc stepped 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 small arc step curve E'F' of the variable tooth height tooth top, (x o_F' ,y o_F' ) are 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 tooth top, 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 involute angle 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 tooth top, θ cr_1 is the center plane angle of the small arc step curve with variable tooth height, θ cr_o_E' ,θ cr_i_F′ 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 tooth 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 circular arc EF segment, (x F_H ,y F_H ) is the horizontal and vertical coordinates of the point on the proximal curve FH segment, k is the coordinate change slope, (x G_H ,y G_H ) is the horizontal and vertical coordinates of the point on the distal curve GH segment, (x G ,y G ) is the coordinates of the point G on the distal curve GH segment, (x H ,y H ) is the coordinates of the point H on the distal curve GH segment.

[0066] The extension line segments EM, FN and MN of the addendum profile 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, which coincides with the variable-thickness addendum small circular arc stepped curve E'F' portion, (x F_N ,y F_N ) is the horizontal and vertical coordinates of the point on the FN segment; φ oi is the profile development angle corresponding to the MN segment on the variable-thickness addendum small circular arc stepped curve E'F'; φ oi_M , φ oi_E , φ oi_N , φ oi_F are the development angles of the points M, E, N and F on the variable-thickness addendum small circular arc stepped curve E'F', respectively, θ cr_1 is the central plane development angle of the MN segment, θ cr_N , θ cr_M are the central plane initial angle and final angle of the MN segment, respectively.

[0069] The dedendum stepped curve A'D' is solved by the following expressions:

[0070]

[0071] In the formula, (x i_A' ,y i_A' ) is the horizontal and vertical coordinates of the inside profile of the scroll dedendum stepped curve, (x cR_A'D' ,y cR_A'D' ) is the horizontal and vertical coordinates of the variable-thickness dedendum large circular arc stepped curve A'D', (x o_D' ,y o_D' ) is the horizontal and vertical coordinates of the outside profile of the scroll dedendum stepped curve, φ i_g is the development angle of the inside profile of the scroll dedendum stepped curve, φcR_i_D' is the initial angle of the variable tooth high tooth root large circular arc step curve inside profile, φ o_g is the development angle of the variable tooth high tooth root large circular arc step curve outside profile, φ cR_o_A' is the initial angle of the variable tooth high tooth root large circular arc step curve outside profile, (x cR_o_1 ,y cR_o_1 ) is the initial horizontal and vertical coordinates of the variable tooth high tooth root large circular arc step curve, θ cR_1 is the central surface development angle of the variable tooth high tooth root large circular arc step curve, θ cR_o_A' , θ cR_i_D' are the initial angle and final angle of the central surface of the variable tooth high tooth root large circular arc step curve, respectively.

[0072] The outside curve AD of the tooth root slide structure is related to the line segments EM, MN and NF of the addendum seal groove profile. The intersection point of the line segment EM or FN and the radial direction is obtained according to the distance of the variable tooth high addendum circular arc step curve E'F' from the line segments EM and FN in the radial direction. The intersection point of the line segment EM and the line connecting the center O0 and the meshing point is calculated according to the following expression:

[0073]

[0074] In the expression, (x E'M_O ,y E′M_O ) are the horizontal and vertical coordinates of the intersection point on the curve A'D' when the E'M segment of the addendum small circular arc step curve E'M and the tooth root large circular arc step curve A'D' are in meshing, (x E'M ,y E′M ) are the horizontal and vertical coordinates of the E'M segment on the variable tooth high addendum small circular arc step curve E'F', (x O ,y O ) are the horizontal and vertical coordinates of the center O point of the tooth root large circular arc step curve, and (x E_M ,y E_M ) are the horizontal and vertical coordinates of the intersection point of EM and the line connecting the center O0 and the meshing point.

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

[0076]

[0077] In the expression, (x F′N_O ,y F′N_O ) are the horizontal and vertical coordinates of the intersection point on the curve A'D' when the F'N segment of the addendum small circular arc step curve E'M and the tooth root large circular arc step curve A'D' are in meshing, (x F′N ,y F′N ) are the horizontal and vertical coordinates of the F'N segment on the variable tooth high addendum small circular arc step curve E'F', (x O ,y O ) are the horizontal and vertical coordinates of the center O point of the tooth root large circular arc step curve, and (xF_N ,y F_N ) are the horizontal and vertical coordinates of the intersection of FN, the center of the circle O0 and the line connecting the meshing point.

[0078] Assuming that point p is the intersection point where the small arc step curve of the tooth addendum 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:

[0079]

[0080] Where, is the distance between the intersection point p when E'M and A'D' are meshed and the outer curve of the slideway, l MN is the distance between the intersection point p when MN and A′D' are meshed and the outer curve of the slideway, is the distance between the intersection point p when NF' and A'D' are meshed and 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' are meshed, (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 circle step curve of the tooth root;

[0083] The outer curve AD consists of three curve segments, 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 root slide structure is obtained by equidistant sealing width of the outer curve. Wherein, the parameters of each large arc and small arc are obtained by given k-stage tooth height and angle position of the step arc, and the sealing curve and slide curve at each step are obtained by the above method. The outer curve of the slide is the limit position curve, and the curve AM' and N'D curve can be moved inward, but the first order continuity of the curve should be ensured, and it should not be stuck in the movement process.

[0087] Please refer to Figure 3 At different angles, the small arc and step sealing structure can be completely meshed with the large arc. The slide sealing structure is composed of a sealing element and a wear-resistant gravity element. The sealing element has the same profile as the tooth tip sealing structure, and the weight of the wear-resistant gravity element is higher than that of the sealing element, and satisfies the following relationship of gravity or rotational inertia force greater than friction force:

[0088] mgcosθ t > μF N

[0089] In the formula, m is the mass of the wear-resistant gravity element, 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 element and the scroll slide groove, and F N is the normal pressure of the wear-resistant gravity element.

[0090] Please refer to FIG. 4(a), FIG. 4(b) and FIG. 4(c), the sealing element and the wear-resistant gravity element of the slide sealing structure are assembled in the form of threaded pins, pin sleeves or dumbbell type structure nesting.

[0091] The wear-resistant gravity element and the root slide structure are wear-resistant, which reduces the surface roughness and prevents the upper stop point or the lower stop point of the root slide structure from being stuck. A sealing element maximum extension limiting mechanism is arranged at the sealing element.

[0092] The step sealing structure generated by the design method of the present application can realize the meshing of the small arc and the large arc at any angle period to form a seal, prevent the leakage of the compression chamber stage, and improve the thermal performance of the scroll machine.

[0093] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features, 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 machinery stepped variable tooth high scroll slideway sealing structure, characterized in that: It includes a tooth top sealing structure and a tooth root slideway structure, wherein the tooth top sealing structure is formed by a head arc. , distal curve , proximal curve and tail curve The tooth root slideway structure is composed of the upper stop curve , lower stop curve , inner curve and outer curve The profile of the tooth top seal structure is controlled by the width of the seal structure, and at the same time meets the minimum wall thickness requirement, which is not less than The thickness of the scroll wheel, the corresponding tooth tip seal groove is composed of the tooth tip seal structure profile and its extended line segment and Determine; the upper and lower dead points of the tooth root slideway structure are controlled by the scroll body profile, wall thickness and sealing structure width, and the inner and outer curves are controlled by line segments 、 with dot The distance and width of the sealing structure are controlled by the point with dot Composition of variable tooth height tooth top small arc step curve , The head arc of the tooth top sealing structure The center of the circle is also the variable tooth height tooth top arc step curve The center of the circle.

2. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: The variable tooth height tooth top arc step curve Solve it by the following expression: Where, is the horizontal and vertical coordinates of the inner profile line of the scroll tooth tip step curve, It is a small arc step curve with variable tooth height and tooth top The horizontal and vertical coordinates of The horizontal and vertical coordinates of the outer profile of the scroll tooth tip step curve; is the base circle radius, is the base circle angle, is the inner profile angle of the scroll tooth tip step curve, The starting angle of the inner profile of the small arc step curve of the variable tooth height tooth top, is the outer profile angle of the scroll tooth tip step curve, The starting angle of the outer profile of the small arc step curve of the variable tooth height tooth top, is the final expansion angle of the involute of the center plane of the vortex disk, is the starting horizontal and vertical coordinates of the small arc step curve of the variable tooth height tooth top, is the center plane angle of the small arc step curve of the variable tooth height tooth top, 、 They are the starting angle and final angle of the center plane of the small arc step curve with variable tooth height; the width of the step seal structure , Step sealing structure height And the center length of the stepped seal structure The following relations are satisfied: Where, is the height of the small arc step at the top of the variable tooth height. , Points ,point The corresponding angle of extension.

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: Where, Distal curve The horizontal and vertical coordinates of the points on the segment, Head arc The horizontal and vertical coordinates of the points on the segment, Proximal curve The horizontal and vertical coordinates of the points on the segment, is the slope of coordinate change, The tail curve The horizontal and vertical coordinates of the points on the segment, The tail curve section The coordinates of the point, The tail curve section H The coordinates of the point.

4. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 3, characterized in that: The profile extension line segment of the tooth tip seal structure 、 as well as Solve by the following expression: Where, for The horizontal and vertical coordinates of the points on the segment, for The horizontal and vertical coordinates of the points on the segment, Segment and variable tooth height tooth top small arc step curve Partial overlap, for The horizontal and vertical coordinates of the points on the segment; It is a small arc step curve with variable tooth height and tooth top on The profile angle corresponding to the segment; 、 、 、 They are respectively the small arc step curves of variable tooth height and tooth top on The span angle corresponding to the point, for Segment center plane angle, 、 They are The starting and ending angles of the segment's center plane.

5. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: tooth root step curve Solve it by the following expression: Where, is the horizontal and vertical coordinates of the inner profile line of the turbine tooth root step curve, It is a large arc step curve with variable tooth height and tooth root The horizontal and vertical coordinates of is the horizontal and vertical coordinates of the outer profile line of the turbine tooth root step curve, is the inner profile angle of the turbine tooth root step curve, The starting angle of the inner profile of the large arc step curve of the variable tooth height tooth root, is the outer profile angle of the turbine tooth root step curve, The starting angle of the outer profile of the large arc step curve of the variable tooth height tooth root, is the starting horizontal and vertical coordinates of the variable tooth height tooth root large arc step curve, is the center plane angle of the large arc step curve of the variable tooth height tooth root, 、 They are the starting angle and final angle of the center plane of the large arc step curve of the variable tooth height tooth root.

6. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: The outer curve of the tooth root slideway structure The line segment with the tooth top sealing groove line Related, by the variable tooth height tooth top arc step curve Along the radial direction and the line segment and Distance, get the line segment or The intersection point with the radial direction is calculated according to the following expression With the center And the intersection of the lines connecting the meshing points: Where, Small arc step curve for tooth top Segment and tooth root large arc step curve When the segments are meshed, the intersection point is on the curve The horizontal and vertical coordinates on It is a small arc step curve with variable tooth height and tooth top on Segment horizontal and vertical coordinates, The center of the large arc step curve of the tooth root The horizontal and vertical coordinates of the point, for and and the horizontal and vertical coordinates of the intersection points of the lines connecting the meshing points; With the center The intersection of the meshing point lines is solved by the following expression: Where, Small arc step curve for tooth top Segment and tooth root large arc step curve When the segments are meshed, the intersection point is on the curve The horizontal and vertical coordinates on It is a small arc step curve with variable tooth height and tooth top superior The horizontal and vertical coordinates of the segment, The center of the large arc step curve of the tooth root The horizontal and vertical coordinates of the point, for With the center And the horizontal and vertical coordinates of the intersection of the lines connecting the meshing points.

7. The scroll machinery stepped variable tooth high scroll slideway sealing structure according to claim 1, characterized in that: Assumptions Point is the intersection point when the small arc step curve of tooth top and the large arc step curve of tooth root are meshed. Outer curve of tooth root slideway structure The distance is solved according to the following expression: Where, for and Intersection point when meshing The distance to the outside curve of the slide, for and Intersection point when meshing The distance to the outside curve of the slide, for and Intersection point when meshing The distance to the outside curve of the slide; for and Intersection point when meshing The horizontal and vertical coordinates of for and Intersection point when meshing The horizontal and vertical coordinates of is the center plane angle of the stepped variable tooth high scroll disk, 、 、 、 Points The corresponding angle parameters; Where, for The horizontal and vertical coordinates of the point, is the horizontal and vertical coordinates of the great circle step curve of the tooth root; The outer curve of the tooth root slideway structure It consists of three curves, namely , solve according to the following expression: Where, For the outer curve The horizontal and vertical coordinates of the points on the segment, For the outer curve The horizontal and vertical coordinates of the points on the segment, For the outer curve The horizontal and vertical coordinates of the point on the 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 width of the seal; 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 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: Where, For the quality of wear-resistant gravity parts, is the acceleration due to gravity, is the direction of gravity and The angle between the axes, is the friction coefficient between the wear-resistant gravity part and the scroll slide groove, 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 slide 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 slide structure are both treated with wear resistance to reduce surface roughness and prevent them from getting stuck at the top dead point or bottom dead point of the tooth root slide structure, and a seal maximum extension limit mechanism is set at the seal.

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