CN110439945B - Assembled linear plate spring for refrigeration compressor - Google Patents
Assembled linear plate spring for refrigeration compressor Download PDFInfo
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- CN110439945B CN110439945B CN201910754995.3A CN201910754995A CN110439945B CN 110439945 B CN110439945 B CN 110439945B CN 201910754995 A CN201910754995 A CN 201910754995A CN 110439945 B CN110439945 B CN 110439945B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
- F16F3/02—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/0035—Gripping
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Abstract
The invention provides an assembled linear plate spring for a refrigeration compressor, which comprises an outer fixing washer, an inner fixing washer and at least two cylindrical spring arms with the same structure, wherein the outer fixing washer and the inner fixing washer are used for mounting and positioning; the center of the inner fixing washer is provided with a shaft hole which is arranged on a piston shaft of the refrigeration compressor, and the periphery of the inner fixing washer is provided with at least two first spring arm mounting grooves which are uniformly distributed and used for mounting one end of a cylindrical spring arm; the outer fixing washer is provided with a mounting hole fixed with a base of the refrigeration compressor, and the periphery of the outer fixing washer is provided with at least two second spring arm mounting grooves which are uniformly distributed and used for mounting the other end of the cylindrical spring arm. The assembled linear plate spring for the refrigeration compressor is applied to the refrigeration compressor, can be freely disassembled and assembled, has a linear force-deformation characteristic curve, meets the axial linear force requirement of a piston shaft of the linear compressor, has a long service life and improves the overall reliability of the compressor, and the spring arm can effectively disperse stress.
Description
Technical Field
The invention relates to the technical field of springs, in particular to a linear plate spring, and particularly relates to an assembled linear plate spring for a refrigeration compressor.
Background
The linear compressor is one of reciprocating piston compressors, in which a supporting technology of a plate spring is a key technology of the linear compressor. The linear motor drives the piston to do reciprocating linear motion in the cylinder, the plate spring is connected with the piston through the piston shaft and serves as an elastic component of the array subsystem to support the piston and the electronic rotor assembly, and the plate spring is required to have enough axial rigidity and stroke to ensure the axial reciprocating motion of the piston. Compared with the traditional cylindrical spring, the plate spring has larger radial rigidity, can ensure that the piston does not deviate from a balance position to generate radial displacement due to vibration in reciprocating linear motion, ensures the clearance sealing between the cylinder and the piston, avoids leakage loss and improves the overall efficiency and reliability of the compressor.
The plate springs in the prior art generally include a linear arm plate spring and a vortex arm plate spring, the two plate springs are generally planar thin spring plates and are designed to have large radial rigidity and small axial rigidity, one or more groups of plate spring plates are generally applied to the linear compressor, and when the plate spring plates are used in a group, a gasket is further added between the spring plates for preventing interference, so that the overall mass of the compressor is increased. The quality of the two plate springs is adjusted by changing the molded lines, the thickness, the arm width and the like, the rigidity and the stress of the plate springs are influenced, the molded lines are complex, and the production cost is high.
According to the theory of electromagnetic field correlation, the linear motor applies a linear force which is absolutely parallel to the axial direction of the piston to the piston, so in theory, a linear plate spring is used, the stable operation of the compressor can be effectively ensured, and the reliability of the whole machine is improved.
The linear plate spring which has a simple structure, can be freely assembled and simultaneously meets the application requirements of certain radial rigidity, axial rigidity, natural frequency and fatigue strength is required in the field, and has better use effect and economic value when being applied to a linear compressor.
The axial stiffness, radial stiffness, fatigue strength and natural frequency of the leaf spring are 4 important performance parameters of the leaf spring. The plate spring does high-speed reciprocating motion along with the compressor, the reciprocating motion of the spring exceeds 20 hundred million times according to working requirements, the stress distribution of the plate spring is required to be uniform during working, the stress concentration phenomenon is avoided, the maximum stress is far less than the fatigue limit of a material, and the plate spring is ensured to have longer service life. To avoid the plate spring arms from breaking due to resonance with the compressor motion, the operating frequency of the linear compressor is required to avoid the natural frequency of the plate spring.
Patent No. CN105757152A discloses a plate spring, a plate spring set and a compressor, and patent No. CN106051036A discloses an equiangular spiral plate spring, which all have the problem that the axial stiffness is small, and a plurality of sets of plate springs are needed to be used under the condition of meeting the stiffness requirement. Patent No. CN108167359A discloses an Archimedes spiral plate spring, the closed mode of the end of a vortex groove is that two sections of arcs which are different in bending direction and tangent are respectively tangent to an outer molded line and an inner molded line of the vortex groove, the design and expression of the molded line of the closed end are complex, the machining difficulty is high, and the concentrated stress is overlarge.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide an assembled linear leaf spring for a refrigeration compressor, which has a large axial stiffness and a large radial stiffness, can meet the required working life of the compressor within a fatigue limit, can be freely disassembled and assembled, has a linear force-deflection characteristic curve, and meets the axial linear force requirement of a piston shaft of the linear compressor.
In order to achieve the above object, the present invention provides an assembled linear plate spring for a refrigeration compressor, comprising an outer fixing washer for installation and positioning, an inner fixing washer, and at least two cylindrical spring arms with the same structure and connected between the outer fixing washer and the inner fixing washer; the center of the inner fixing washer is provided with a shaft hole which is arranged on a piston shaft of the refrigeration compressor, and the periphery of the inner fixing washer is provided with at least two first spring arm mounting grooves which are uniformly distributed and used for mounting one end of a cylindrical spring arm; the outer fixing washer is provided with a mounting hole fixed with a base of the refrigeration compressor, and the periphery of the outer fixing washer is provided with at least two second spring arm mounting grooves which are uniformly distributed and used for mounting the other ends of the cylindrical spring arms; the cylindrical spring arm comprises a head end cylindrical pin, a first section of linear arm, a first section of transition arm, a spiral involute arm, a second section of transition arm, a second section of linear arm and a tail end cylindrical pin which are connected in sequence.
The spring arms can be freely assembled and disassembled and combined, when the spring is displaced and deformed in work, the cylindrical pin heads at the head ends of the spring arms can effectively weaken the torsional force caused by the axial movement of the internal fixing gaskets, and avoid the stress concentration of the spring arms, and the characteristic curve of the force-deformation amount of the assembled linear plate spring for the refrigeration compressor is linear, so that the linear rigidity load requirement of the compressor can be met when the assembled linear plate spring is used in the linear compressor, and the integral reliability of the compressor is improved.
Further, the first spring arm mounting groove of internal fixation packing ring include with the first fixed keyway of head end fixed pin complex of cylindrical spring arm and with the first fixed armgroove of first section sharp arm complex of cylindrical spring arm, the junction in first fixed keyway and first fixed armgroove adopts the circular arc transition, the tail end in first fixed armgroove adopts the circular arc transition.
Optionally, the first fixing pin groove of the first spring arm mounting groove is a cylindrical groove, and the radius of the first fixing pin groove is equal to the radius of the head end fixing pin; the central line of a first fixing pin groove of the first spring arm mounting groove is tangent to a middle circle between an inner circle and an outer circle of the inner fixing washer; the first fixing pin groove of the first spring arm mounting groove is a cylindrical groove, and the radius of the first fixing pin groove is equal to that of the cylindrical spring arm.
Furthermore, the central line of the cylindrical spring arm consists of a first straight line, a first transition arc, a three-dimensional spiral circle involute, a second transition arc and a second straight line which are connected in sequence; the first straight line passes through the center of the inner fixing washer, and the second straight line passes through the center of the outer fixing washer;
the equation of the three-dimensional spiral involute under a Cartesian coordinate system is as follows:
x＝r(cosθ+θsinθ)；y＝r(sinθ-θcosθ)；z＝ht；
wherein r is a base circle radius, theta is an involute spread angle, h is an involute head-tail height difference, and t is a variable.
Preferably, two ends of the first transition arc are respectively tangent to the first straight line and the three-dimensional spiral involute;
and two ends of the second transition arc are respectively tangent to the three-dimensional spiral circle involute and the second straight line.
Preferably, the inner fixing washer is divided into an inner upper washer and an inner lower washer which are identical in structure, and at least two fixing holes which are uniformly distributed are formed in the inner fixing washer; the inner upper gasket and the inner lower gasket are in locking fit through the fixing holes and are used for clamping the head ends of the cylindrical spring arms; the circle center of the fixing hole is on the middle circle between the inner circle and the outer circle of the inner fixing washer.
Further, the second spring arm mounting groove of outer fixed washer include with the tail end fixed pin complex second fixed pin groove of cylindrical spring arm and with the second section straight line arm complex second fixed arm groove of cylindrical spring arm, the junction in second fixed pin groove and second fixed arm groove adopts the circular arc transition, the tail end in second fixed arm groove adopts the circular arc transition.
Preferably, the second fixing pin groove of the second spring arm mounting groove is a cylindrical groove, and the radius of the second fixing pin groove is equal to that of the tail end cylindrical pin; the central line of a second fixing pin groove of the second spring arm mounting groove is tangent to a middle circle between the inner circle and the outer circle of the outer fixing washer; the second fixing pin groove of the second spring arm mounting groove is a cylindrical groove, and the radius of the second fixing pin groove is equal to that of the cylindrical spring arm.
Optionally, the outer fixing washer is divided into an outer upper washer and an outer lower washer which have the same structure, and the outer upper washer and the outer lower washer clamp and fix the tail end of the cylindrical spring arm through the mounting hole.
The assembled linear plate spring for the refrigeration compressor is formed by assembling an outer fixing washer, an inner fixing washer and at least two cylindrical spring arms with the same structure, wherein the spring arm is a three-dimensional spiral arm, and the central line of the spring arm consists of two straight lines, a three-dimensional spiral involute and two transition arcs. The assembled linear plate spring for the refrigeration compressor is applied to the refrigeration compressor, can be freely disassembled and assembled, has a linear force-deformation characteristic curve, meets the axial linear force requirement of a piston shaft of the linear compressor, has a long service life, improves the overall reliability of the compressor, and has the following advantages:
1. the assembled linear plate spring for the refrigeration compressor is assembled by an outer fixing washer, an inner fixing washer and at least two cylindrical spring arms with the same structure, is convenient to disassemble and assemble, and can freely adjust the number of spring arms.
2. The spring arm of the assembled linear plate spring for the refrigeration compressor is a three-dimensional spiral arm, the stress distribution of the spring arm is uniform, the local stress is small, and the service life is longer.
3. The cylindrical pin at the head end of the spring arm of the assembled linear plate spring for the refrigeration compressor can axially rotate in the mounting groove of the inner fixing washer, so that the torsional force caused by the central displacement and deformation of the plate spring to the head end of the spring arm is effectively weakened.
4. The assembled linear plate spring for the refrigeration compressor has higher axial stiffness and radial stiffness, and the force-deflection characteristic curve of the spring is linear, so that the requirement of the linear force of the piston shaft of the linear compressor in the axial direction is met, and the assembled linear plate spring for the refrigeration compressor has better effect when being used for the refrigeration linear compressor.
Drawings
Fig. 1 is a front view of an assembled linear plate spring for a refrigerating compressor according to a first embodiment of the present invention;
fig. 2 is a side view of an assembled linear leaf spring for a refrigeration compressor according to a first embodiment of the present invention;
fig. 3 is a front view of an inner upper washer or an inner lower washer of an assembled linear plate spring for a refrigeration compressor according to a first embodiment of the present invention;
FIG. 4 is a longitudinal cross-sectional view of FIG. 3;
fig. 5 is a front view of the cylindrical spring arm of the assembled linear leaf spring for a refrigeration compressor according to the first embodiment of the present invention;
fig. 6 is a side view of the cylindrical spring arm of the assembled linear leaf spring for a refrigeration compressor according to a first embodiment of the present invention;
fig. 7 is a front view of an outer upper washer or an outer lower washer of an assembled linear plate spring for a refrigeration compressor according to a first embodiment of the present invention;
FIG. 8 is a longitudinal cross-sectional view of FIG. 7;
FIG. 9 is a graph showing the response of the axial displacement applied by the assembled linear leaf spring for a refrigeration compressor according to the first embodiment of the present invention to the corresponding axial force;
fig. 10 is a front view of an assembled linear plate spring for a refrigerating compressor according to a second embodiment of the present invention;
fig. 11 is a side view of an assembled linear leaf spring for a refrigeration compressor according to a second embodiment of the present invention;
fig. 12 is a front view of an inner upper washer or an inner lower washer of an assembled linear plate spring for a refrigerating compressor according to a second embodiment of the present invention;
fig. 13 is a front view of the cylindrical spring arm of the assembled linear leaf spring for a refrigeration compressor according to the second embodiment of the present invention;
fig. 14 is a side view of the cylindrical spring arm of the assembled linear leaf spring for a refrigeration compressor according to the second embodiment of the present invention;
fig. 15 is a front view of an outer upper washer or an outer lower washer of an assembled linear plate spring for a refrigerating compressor according to a second embodiment of the present invention;
fig. 16 is a response graph of the axial displacement applied by the assembled linear leaf spring for the refrigeration compressor according to the second embodiment of the present invention and the corresponding axial force.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
The assembled linear plate spring for a refrigeration compressor according to the present invention is described in detail with reference to fig. 1 to 16, and is mainly applicable to a linear refrigeration compressor, and includes an outer fixing washer, an inner fixing washer, and at least two cylindrical spring arms having the same structure. The inner fixing washer is concentric with the outer fixing washer, and the spring arms are uniformly distributed along the center of the inner fixing washer.
As shown in fig. 1 and 10, a plurality of cylindrical spring arms are uniformly distributed around the inner fixing washer, a head end cylindrical pin and a first section of linear arm are assembled with the spring arm mounting groove of the inner fixing washer, and a tail end cylindrical pin and a second section of linear arm are assembled with the spring arm mounting groove of the outer fixing washer.
The inner upper gasket and the inner lower gasket of the inner fixing gasket are locked and fixed through a fixing hole and are arranged on a piston shaft of the refrigeration linear compressor through a central shaft hole. And the outer upper gasket and the outer lower gasket of the outer fixing gasket are fixed with the base of the refrigeration linear compressor through the mounting holes.
The cylindrical spring arm comprises a head end cylindrical pin, a first section of linear arm, a first section of transition arm, a spiral circle involute arm, a second section of transition arm, a second section of linear arm and a tail end cylindrical pin. Correspondingly, the central line of the cylindrical spring arm consists of two straight lines, a three-dimensional spiral circle involute and two transition arcs.
The first straight line of the central line of the cylindrical spring arm at the head end passes through the center of the inner fixing washer, and the second straight line of the central line of the cylindrical spring arm at the tail end passes through the center of the outer fixing washer; the equation of a three-dimensional spiral circle involute of the central line of the cylindrical spring arm in a Cartesian coordinate system is x-r (cos theta + theta sin theta); y ═ r (sin θ - θ cos θ); z ═ ht; wherein r is a base circle radius, theta is an involute spread angle, h is an involute head-tail height difference, t is a variable, and the involute spread angle theta is 300-600 degrees in a three-dimensional spiral circle involute equation.
In addition, the central line of the head end cylindrical pin of the cylindrical spring arm is vertically intersected with the central line of the first section of linear arm of the cylindrical spring arm, namely, the head end cylindrical pin and the first section of linear arm are vertically arranged, and the diameter of the cylindrical fixing pin is equal to that of the cylindrical spring arm. The central line of the tail end cylindrical pin of the cylindrical spring arm is vertically intersected with the central line of the second section of linear arm of the cylindrical spring arm, namely, the tail end cylindrical pin and the second section of linear arm are vertically arranged, and the diameter of the tail end cylindrical pin is equal to that of the cylindrical spring arm. The head end of the central line of the first section of transition arm of the cylindrical spring arm is tangent to the central line of the first section of linear arm, and the tail end of the first section of transition arm of the cylindrical spring arm is tangent to the three-dimensional spiral involute. The head end of the central line of the second section of transition arm of the cylindrical spring arm is tangent to the three-dimensional spiral involute, and the tail end of the central line of the second section of transition arm of the cylindrical spring arm is tangent to the central line of the second section of linear arm; the center line of the second linear arm of the cylindrical spring arm passes through the center of the outer stationary washer.
The cylindrical spring arm of the present invention is a three-dimensional spiral arm that is cylindrical and has a constant diameter.
Example one
As shown in fig. 1 to 9, the leaf spring in this example comprises two axially symmetrical cylindrical spring arms 3 of identical construction, as well as an outer fixing washer 1, 2 and an inner fixing washer 4, 5.
As shown in fig. 3, the inner fixing washers 4 and 5 include a central shaft hole 10, two fixing holes 8 distributed uniformly, and two spring arm mounting grooves 9 distributed uniformly; the circle center of the fixing hole 8 of the inner fixing washer 4, 5 is on the middle circle between the inner circle and the outer circle of the inner fixing washer 4, 5; spring arm mounting groove 9 of internal fixation packing ring 4, 5 include with the first fixed keyway of head end fixed pin 31 complex of cylindrical spring arm 3 and with the first fixed armgroove of first section straight line arm 32 complex of cylindrical spring arm 3, the junction in first fixed keyway and first fixed armgroove adopts the circular arc transition, the tail end in first fixed armgroove adopts the circular arc transition.
The inner fixing washers 4 and 5 of the present embodiment are divided into an inner upper washer 4 and an inner lower washer 5 which have the same structure, and the inner upper washer 4 and the inner lower washer 5 are locked and matched through the fixing hole 8 to fix the head end of the cylindrical spring arm 3. The first fixing pin grooves of the spring arm mounting grooves 9 on the inner upper gasket 4 and the inner lower gasket 5 are semi-cylindrical grooves with the radius of 2 mm; the centre line of the first fixing pin slot of the spring arm mounting slot 9 of the inner fixing washer 4, 5 is tangent to the middle circle between the inner and outer circles of the inner fixing washer 4, 5. The first fixed arm grooves of the spring arm mounting grooves 9 of the inner upper gasket 4 and the inner lower gasket 5 are semi-cylindrical grooves with the radius of 2 mm.
As shown in fig. 1, the included angle of two cylindrical spring arms 3 is 180 °, the diameter of cylindrical spring arm 3 is 4mm, the diameter of head end cylindric lock 31 of cylindrical spring arm 3 is 4mm, the length of first section straight line arm 32 is 10mm, and head end cylindric lock 31 sets up with first section straight line arm 32 is perpendicular, first section transition arm 33 respectively with first section straight line arm 32 and spiral circle involute arm 34 transitional coupling, second section transition arm 35 respectively with spiral circle involute arm 34 and second section straight line arm 36 transitional coupling, the length of second section straight line arm 36 is 10mm, the diameter of tail end cylindric lock 37 is 4mm, and tail end cylindric lock 37 sets up with second section straight line arm 36 is perpendicular. The center line of the spiral involute arm 34 is defined by the equation x ═ r (cos θ + θ sin θ); y ═ r (sin θ - θ cos θ); z ═ ht; wherein r is 0.1, θ is 500 °, h is 24mm, and t is a variable.
As shown in fig. 7 and 8, the outer fixing washers 1, 2 include 6 mounting holes 6, two spring arm mounting grooves 7 uniformly distributed; the circle center of the mounting hole 6 of the outer fixed washer 1, 2 is on the middle circle between the inner circle and the outer circle of the outer fixed washer 1, 2; spring arm mounting groove 7 of outer fixed washer 1, 2 include with tail end fixed pin 37 complex second fixed pin groove of cylindrical spring arm 3 and with tail end straight line arm 36 complex second fixed arm groove of cylindrical spring arm 3, the junction in second fixed pin groove and second fixed arm groove adopts the circular arc transition, and the tail end in second fixed arm groove adopts the circular arc transition.
The outer fixing washers 1 and 2 are divided into an outer upper washer 1 and an outer lower washer 2 which are identical in structure, and are fixed on the compressor base through mounting holes 6 to clamp and fix the tail ends of the cylindrical spring arms 3. The second fixing pin grooves of the spring arm mounting grooves 7 of the outer upper gasket 1 and the outer lower gasket 2 are semi-cylindrical grooves with the radius of 2 mm; the central line of a second fixing pin groove of the spring arm mounting groove 7 of the outer fixing washers 1 and 2 is tangent to a middle circle between an inner circle and an outer circle of the outer fixing washers 1 and 2; and the second fixing arm grooves of the spring arm mounting grooves 7 of the outer upper gasket 1 and the outer lower gasket 2 are semi-cylindrical grooves with the radius of 2 mm.
The assembled linear plate spring for the refrigeration compressor of the first embodiment is introduced into finite element analysis softwareAnalyzing in Ansys, taking the displacement applied to the axial direction of the plate spring as a variable, taking the required axial force correspondingly output as a target, and taking the displacement applied to the axial direction of the plate spring as a displacement range of 1-10 mm, a response curve graph of the axial displacement and the required axial force can be obtained, and as shown in fig. 9, a force-deformation characteristic curve of the spring is linear and is based on a stiffness formula
Wherein F is the applied force load and X is the deformation displacement, the axial stiffness of the first embodiment is about 11N/mm, and the requirement of the linear compressor can be met.
Example two
As shown in fig. 10 to 16, the leaf spring in this example comprises three axially symmetrical cylindrical spring arms 30 of identical construction, as well as outer fixing washers 10, 20 and inner fixing washers 40, 50.
As shown in fig. 12, the inner fixing washers 40, 50 include a central shaft hole 100, three evenly distributed fixing holes 80, and three evenly distributed spring arm mounting grooves 90; the center of the fixing hole 80 of the inner fixing washer 40, 50 is on the middle circle between the inner circle and the outer circle of the inner fixing washer 40, 50; the spring arm mounting groove 90 of the internal fixing washer 40 or 50 includes a first fixing pin groove matched with the head end fixing pin 301 of the cylindrical spring arm 30 and a first fixing arm groove matched with the first section linear arm 302 of the cylindrical spring arm 30, the joint of the first fixing pin groove and the first fixing arm groove adopts circular arc transition, and the tail end of the first fixing arm groove adopts circular arc transition.
The inner fixing washers 40 and 50 of this embodiment are divided into an inner upper washer 40 and an inner lower washer 50 which have the same structure, and the inner upper washer 40 and the inner lower washer 50 are locked and matched through the fixing hole 80 to fix the head end of the cylindrical spring arm 30. The first fixing pin grooves of the spring arm mounting grooves 90 of the inner upper gasket 40 and the inner lower gasket 50 are semi-cylindrical grooves with a radius of 2 mm; the center line of the first fixing pin groove of the spring arm mounting groove 90 of the inner fixing washer 40, 50 is tangent to the middle circle between the inner and outer circles of the inner fixing washer 40, 50; the first fixed arm slots of the spring arm mounting slots 90 of the inner upper gasket 40 and the inner lower gasket 50 are semi-cylindrical slots with a radius of 2 mm.
As shown in fig. 10, the included angle of the three cylindrical spring arms 30 is 120 °, the diameter of each cylindrical spring arm 30 is 4mm, the diameter of the first-end cylindrical pin 301 of each cylindrical spring arm 30 is 4mm, the length of the first-section linear arm 302 is 10mm, the first-end cylindrical pin 301 and the first-section linear arm 302 are vertically arranged, the first-section transition arm 303 is in transition connection with the first-section linear arm 302 and the spiral-circle involute arm 304 respectively, the second-section transition arm 305 is in transition connection with the spiral-circle involute arm 304 and the second-section linear arm 306 respectively, the length of the second-section linear arm 306 is 10mm, the diameter of the tail-end cylindrical pin 307 is 4mm, and the tail-end cylindrical pin 307 and the second-section linear arm 306 are vertically arranged. The center line of the spiral involute arm 304 is defined by the equation x ═ r (cos θ + θ sin θ); y ═ r (sin θ - θ cos θ); z ═ ht; wherein r is 0.1, θ is 500 °, h is 24mm, and t is a variable.
As shown in fig. 15, the outer fixing washers 10, 20 include 6 mounting holes 60, three evenly distributed spring arm mounting slots 70; the circle center of the mounting hole 60 of the outer fixing washer 10, 20 is on the middle circle between the inner circle and the outer circle of the outer fixing washer 10, 20; the spring arm mounting groove 70 of the outer fixing washer 10 or 20 includes a second fixing pin groove matched with the tail end fixing pin 307 of the cylindrical spring arm 30 and a second fixing arm groove matched with the tail end linear arm 306 of the cylindrical spring arm 30, the joint of the second fixing pin groove and the second fixing arm groove adopts circular arc transition, and the tail end of the second fixing arm groove adopts circular arc transition.
The outer fixing washers 10 and 20 are divided into an outer upper washer 10 and an outer lower washer 20 which have the same structure, and are fixed on the compressor base through the mounting holes 60, and the tail ends of the cylindrical spring arms 30 are clamped and fixed. The second fixing pin grooves of the spring arm mounting grooves 70 of the outer upper gasket 10 and the outer lower gasket 20 are semi-cylindrical grooves with the radius of 2 mm; the center line of the second fixing pin groove of the spring arm mounting groove 70 of the outer fixing washer 10, 20 is tangent to the middle circle between the inner circle and the outer circle of the outer fixing washer 10, 20; the second fixing arm grooves of the spring arm mounting grooves 70 of the outer upper gasket 10 and the outer lower gasket 20 are semi-cylindrical grooves with a radius of 2 mm.
The assembled linear leaf spring for the refrigeration compressor of the second embodiment is introduced into finite element analysis software Ansys for analysis, the displacement applied to the leaf spring in the axial direction is taken as a variable, the required axial force output correspondingly is taken as a target, the displacement applied to the leaf spring in the axial direction ranges from 1 mm to 10mm, and a response curve graph of the axial displacement and the required axial force can be obtained, as shown in fig. 16, the force-deformation characteristic curve of the spring is linear, and the force-deformation characteristic curve is obtained according to a stiffness formula
Wherein F is the applied force load and X is the deformation displacement, the axial rigidity of the second embodiment is about 17N/mm, and the requirement of the linear compressor can be met.
The assembled linear plate spring for the refrigeration compressor is assembled by an outer fixing washer, an inner fixing washer and at least two cylindrical spring arms with the same structure, is convenient to disassemble and assemble, and can freely adjust the number of spring arms. The spring arm can effectively weaken the torsional force caused by the central displacement deformation of the plate spring to the head end of the spring arm, the stress distribution is uniform, the local stress is small, the service life is longer, the axial stiffness and the radial stiffness are larger, the characteristic curve of the force-deformation of the spring is linear, the axial linear force requirement of the piston shaft of the linear compressor is met, the linear compressor for refrigerating has a better effect, and the integral reliability of the compressor is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. An assembled linear plate spring for a refrigeration compressor is characterized by comprising an outer fixing washer, an inner fixing washer and at least two cylindrical spring arms, wherein the outer fixing washer and the inner fixing washer are used for installation and positioning;
the center of the inner fixing washer is provided with a shaft hole which is arranged on a piston shaft of the refrigeration compressor, and the periphery of the inner fixing washer is provided with at least two first spring arm mounting grooves which are uniformly distributed and used for mounting one end of a cylindrical spring arm;
the outer fixing washer is provided with a mounting hole fixed with a base of the refrigeration compressor, and the periphery of the outer fixing washer is provided with at least two second spring arm mounting grooves which are uniformly distributed and used for mounting the other ends of the cylindrical spring arms;
the cylindrical spring arm comprises a head end cylindrical pin, a first section of linear arm, a first section of transition arm, a spiral circle involute arm, a second section of transition arm, a second section of linear arm and a tail end cylindrical pin which are connected in sequence;
the first spring arm mounting groove of the internal fixing washer comprises a first fixing pin groove matched with a fixing pin at the head end of the cylindrical spring arm and a first fixing arm groove matched with a first section of linear arm of the cylindrical spring arm, the joint of the first fixing pin groove and the first fixing arm groove adopts circular arc transition, and the tail end of the first fixing arm groove adopts circular arc transition;
the first fixing pin groove of the first spring arm mounting groove is a cylindrical groove, and the radius of the first fixing pin groove is equal to that of the head end fixing pin;
the central line of a first fixing pin groove of the first spring arm mounting groove is tangent to a middle circle between an inner circle and an outer circle of the inner fixing washer;
the first fixing pin groove of the first spring arm mounting groove is a cylindrical groove, and the radius of the first fixing pin groove is equal to that of the cylindrical spring arm.
2. The assembled linear plate spring for a refrigerating compressor according to claim 1, wherein the center line of the cylindrical spring arm is composed of a first straight line, a first transitional arc, a three-dimensional spiral involute, a second transitional arc and a second straight line which are connected in sequence;
the first straight line passes through the center of the inner fixing washer, and the second straight line passes through the center of the outer fixing washer;
the equation of the three-dimensional spiral involute under a Cartesian coordinate system is as follows:
x＝r(cosθ+θsinθ)；y＝r(sinθ-θcosθ)；z＝ht；
wherein r is a base circle radius, theta is an involute spread angle, h is an involute head-tail height difference, and t is a variable.
3. The assembled linear plate spring for a refrigerating compressor according to claim 2, wherein both ends of the first transitional arc are respectively tangent to the first straight line and the three-dimensional spiral involute;
and two ends of the second transition arc are respectively tangent to the three-dimensional spiral circle involute and the second straight line.
4. The assembled linear plate spring for a refrigerating compressor according to claim 1, wherein the inner fixing washer is divided into an inner upper washer and an inner lower washer having the same structure, and at least two fixing holes are uniformly distributed on the inner fixing washer; the inner upper gasket and the inner lower gasket are in locking fit through the fixing holes and are used for clamping the head ends of the cylindrical spring arms;
the circle center of the fixing hole is on the middle circle between the inner circle and the outer circle of the inner fixing washer.
5. The assembled linear plate spring for a refrigerating compressor according to claim 1, wherein the second spring arm mounting groove of the outer fixing washer comprises a second fixing pin groove engaged with the tail end fixing pin of the cylindrical spring arm and a second fixing arm groove engaged with the second section linear arm of the cylindrical spring arm, a junction of the second fixing pin groove and the second fixing arm groove adopts an arc transition, and a tail end of the second fixing arm groove adopts an arc transition.
6. The assembled linear plate spring for a refrigerating compressor according to claim 5, wherein the second fixing pin groove of the second spring arm mounting groove is a cylindrical groove having a radius equal to that of the tail cylindrical pin;
the central line of a second fixing pin groove of the second spring arm mounting groove is tangent to a middle circle between the inner circle and the outer circle of the outer fixing washer;
the second fixing pin groove of the second spring arm mounting groove is a cylindrical groove, and the radius of the second fixing pin groove is equal to that of the cylindrical spring arm.
7. The assembled linear leaf spring for a refrigerant compressor of claim 1 wherein the outer fixing washer is divided into an outer upper washer and an outer lower washer of identical construction, the outer upper washer and the outer lower washer clampingly fixing the trailing end of the cylindrical spring arm through the mounting hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910754995.3A CN110439945B (en) | 2019-08-15 | 2019-08-15 | Assembled linear plate spring for refrigeration compressor |
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| CN201910754995.3A CN110439945B (en) | 2019-08-15 | 2019-08-15 | Assembled linear plate spring for refrigeration compressor |
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| CN110439945B true CN110439945B (en) | 2021-04-06 |
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| CN116006607A (en) * | 2022-12-26 | 2023-04-25 | 上海海洋大学 | Leaf spring for low-temperature refrigerator and low-temperature refrigerator |
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| JP2003247580A (en) * | 2002-02-26 | 2003-09-05 | Sharp Corp | Flat spring, linear motor compressor, and stirling engine |
| GB0602035D0 (en) * | 2006-02-01 | 2006-03-15 | Isis Innovation | Reciprocating thermodynamic machine |
| CN201198826Y (en) * | 2007-12-28 | 2009-02-25 | 中国航天科技集团公司第五研究院第五一〇研究所 | Leaf spring box component |
| CN105757152B (en) * | 2014-12-18 | 2018-02-16 | 珠海格力节能环保制冷技术研究中心有限公司 | Flat spring, plate spring groups and compressor |
| CN105179540B (en) * | 2015-08-25 | 2018-06-26 | 同济大学 | The flat spring and the compressor using the flat spring of fan-shaped spring arm and its composition |
| CN108194548B (en) * | 2017-12-28 | 2023-12-29 | 陕西仙童科技有限公司 | Plate spring, plate spring set and compressor |
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