CN111255671B - High-load transmission device of vertical eccentric rotary diaphragm pump - Google Patents
High-load transmission device of vertical eccentric rotary diaphragm pump Download PDFInfo
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- CN111255671B CN111255671B CN202010213622.8A CN202010213622A CN111255671B CN 111255671 B CN111255671 B CN 111255671B CN 202010213622 A CN202010213622 A CN 202010213622A CN 111255671 B CN111255671 B CN 111255671B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/047—Pumps having electric drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/14—Provisions for readily assembling or disassembling
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
- F16C3/22—Cranks; Eccentrics
- F16C3/28—Adjustable cranks or eccentrics
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/201—Composition of the plastic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/14—Self lubricating materials; Solid lubricants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a high-load long-life transmission device of a vertical eccentric rotary diaphragm pump, which comprises an eccentric wheel, a transmission shaft, a supporting frame, a bag seat and a shaft sleeve, wherein the transmission is realized by matching the supporting frame with the bag seat, the eccentric wheel is arranged on an output shaft of a motor, a lower groove is formed at the eccentric position of the eccentric wheel, the lower end of the transmission shaft is inserted into the lower groove of the eccentric wheel and contacts with the lower groove, the middle section part of the transmission shaft is fixed in the supporting frame and drives the supporting frame, a central hole is formed at the central position of the bag seat, the shaft sleeve and the bag seat are formed in a split mode, the shaft sleeve is fixedly arranged in the central hole, an upper groove is formed at the center of the shaft sleeve, and the upper end of the transmission shaft is inserted into the upper groove of the shaft sleeve and is supported by the inner wall of the upper groove. The shaft sleeve and the bag seat can be made of different materials respectively, so that the problem of abrasion resistance of the transmission shaft and the upper groove is solved, the rigidity strength of the bag seat under high pressure load in the compression and expansion movement of the bag body is ensured, the bag seat is suitable for long-time use under high load, the normal and effective transmission is ensured, and the cost of parts is lower.
Description
Technical Field
The invention relates to the technical field of diaphragm pumps, in particular to a transmission device of a vertical eccentric rotary diaphragm pump, which is particularly suitable for high-load transmission so as to prolong the service life.
Background
In the prior art, as shown in fig. 1 to 5, a vertical eccentric rotary diaphragm pump is generally shown, a motor 10 and a base 20 are locked and connected together by screws, an eccentric wheel 30 is fixedly mounted on an output shaft of the motor, a transmission shaft 40 is fixed in a supporting frame 50, a lower end of the transmission shaft 40 is contacted with a lower groove a of the eccentric wheel 30, an upper end is contacted with an upper groove b at a central position of a capsule seat 60, a capsule 70 is sleeved in the capsule seat 60 from above, the bottom of the capsule 70 is connected to a supporting arm of the supporting frame 50, a top cover 80 is arranged on the capsule seat 60, and the top cover 80, the capsule 70, the capsule seat 60 and the base 20 are fixed together by means of a buckle. When in operation, the motor 10 is driven to the eccentric wheel 30 to drive the transmission shaft 40 to eccentrically rotate, so that the supporting arm of the supporting frame 50 moves up and down to drive the bag body 70 to suck or press out, thereby pumping out fluid.
Among them, the prior art transmission structure, as shown in fig. 6, generally includes an eccentric 30, a transmission shaft 40 and a supporting frame 50 and cooperates with a capsule seat 60 to realize a transmission function, and the present inventors have carefully analyzed the structure thereof, and found that the following problems exist:
1. the upper groove b at the central position of the bag seat 60 is arranged on the bag seat 60 in an integral injection molding mode; considering that the upper groove b is in contact with the transmission shaft 40, the bag seat 60 must be made of wear-resistant materials; however, the wear-resistant material is generally weak in terms of temperature resistance and rigidity, and if the entire capsule seat 60 is made of wear-resistant and high-temperature-resistant materials, the cost will be high, so in fact, the capsule seat 60 is generally made of materials with good wear resistance but poor high temperature resistance; however, high temperature is easily generated in the occasion of long-time operation under high load, so that the capsule seat 60 is easy to collapse and deform in use or the upper groove b is seriously worn, and even fails; as such, such integrally molded capsule seat 60 construction is not suitable for long-term use under high loads;
2. the transmission shaft 40 contacts with the upper groove b of the bag seat 60, the upper groove b is a conical horn mouth, and the risks of top dead and load current rising are easy to occur; the control requirement on the press-in assembly precision of the eccentric wheel 30 and the motor output shaft is high;
3. the transmission shaft 40 and the support frame 50 are in a press-fit interference fit mode, the retention force of the transmission shaft 40 and the support frame 50 depends on the interference magnitude, the material hardness and the contact area of the inner diameter of the shaft hole of the support frame 50, and in the application occasion of long-time operation under high load, the transmission shaft 40 is easy to loosen and lose efficacy;
4. the transmission shaft 40 of the transmission device may be replaced by a special-shaped shaft 40', as shown in fig. 7, the special-shaped shaft 40' is composed of a circular shaft with a large outer diameter at the central part and circular shafts with small outer diameters at the two ends, in order to improve the torque holding force between the special-shaped shaft 40 'and the support frame 50, the circular shaft with the large outer diameter is processed into a knurled shaft, and the special-shaped shaft 40' has high processing cost and is not suitable for mass production.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a high-load long-service-life transmission device of a vertical eccentric rotary diaphragm pump, which is suitable for long-time use under high load and ensures normal and effective transmission.
In order to achieve the above object, the solution of the present invention is:
the high-load long-life transmission device of the vertical eccentric rotary diaphragm pump comprises an eccentric wheel, a transmission shaft, a supporting frame, a bag seat and a shaft sleeve, wherein the transmission is realized by matching the supporting frame with the bag seat, the eccentric wheel is arranged on an output shaft of a motor for providing working power of the diaphragm pump, the output shaft of the motor is positioned on a longitudinal axis of the diaphragm pump, a lower groove is formed at the eccentric position of the eccentric wheel, the lower end of the transmission shaft is inserted into the lower groove of the eccentric wheel, the lower end of the transmission shaft is contacted with the lower groove and driven by the eccentric wheel to rotate, the middle section part of the transmission shaft is fixed in the supporting frame and drives the supporting frame to rotate along with the transmission shaft, the bag seat for installing the bag body forms a central hole at the central position, the central line of the central hole is positioned on the longitudinal axis of the diaphragm pump, the shaft sleeve and the bag seat are formed in a split mode, the shaft sleeve is tightly fixed in the central hole of the bag seat, the center of the shaft sleeve forms an upper groove, the upper end of the transmission shaft is inserted into the upper groove of the shaft sleeve, and the upper end of the transmission shaft is contacted with the upper groove of the shaft and the upper end of the transmission shaft is supported by the inner wall of the upper groove.
Further, the shaft sleeve is made of self-lubricating and wear-resistant plastic materials such as POM and PEEK; the bag seat is made of high-temperature-resistant high-strength plastic material, such as PPA, PA, PC containing glass fibers; the shaft sleeve and the bag seat are in split injection molding, and the shaft sleeve is pressed into the central hole of the bag seat through interference fit.
Furthermore, the inner diameter of the central hole of the capsule seat is in a shape of big upper part, small lower part and a step in the middle, the outer diameter of the shaft sleeve is also in a shape of big upper part and small lower part, the upper part of the shaft sleeve is provided with a convex wall, the outer wall of the convex wall is in interference fit with the inner wall of the upper part of the central hole through the convex wall arranged on the step, and the shaft sleeve is fixedly arranged in the central hole of the capsule seat from top to bottom.
Further, the shaft sleeve is in a shape that the upper end is closed, the lower end forms an upper groove, the upper groove is provided with a conical horn mouth, and the upper end of the transmission shaft is in contact with the inner wall of the conical horn mouth of the shaft sleeve.
Further, the shape of the upper groove of the shaft sleeve is as follows: the opening part is a conical horn mouth, the bottom is a cylindrical surface counter bore, and the inclined plane angle of the conical horn mouth is larger than the inclined angle of the transmission shaft.
Further, the outer diameter part of the upper end of the transmission shaft is in contact with the cambered surface at the transition part of the cylindrical surface counter bore and the conical horn mouth of the shaft sleeve, and the ball head surface of the upper end of the transmission shaft extends into the cylindrical surface counter bore beyond the cambered surface; the depth of the cylindrical surface counter bore is enough to ensure that the upper end ball head surface of the transmission shaft is not contacted with the bottom surface of the cylindrical surface counter bore.
Further, the shape of the lower groove of the eccentric wheel is as follows: the groove wall of the other half close to the eccentric wheel shaft is a conical surface, the groove wall of the other half far away from the eccentric wheel shaft is a cylindrical surface, the bottom surface of the lower groove is a plane, the lower end ball head surface of the transmission shaft is in contact with the bottom surface of the lower groove, and the lower end ball head surface of the transmission shaft is in contact with the bottom part of the conical surface of the lower groove at a rounded corner part where the outer diameter part of the lower end ball head surface of the transmission shaft is in transition.
Further, the central axis of the transmission shaft and the side wall of the conical surface of the lower groove of the eccentric wheel form an included angle beta of 1-5 degrees.
Further, the transmission shaft is made of stainless steel, the support frame is made of high-temperature-resistant plastic, such as PPA, PA, PC containing glass fibers, and the middle section part of the transmission shaft is fixed with the support frame through integral injection molding. The middle section part of the transmission shaft is provided with a groove tangential plane with a D-shaped section. Straight knurling, reticulate knurling or key grooves are arranged at the middle section of the transmission shaft.
The central axis of the transmission shaft forms an included angle alpha with the longitudinal axis, and the ideal angle range of alpha is 11-15 degrees.
After the scheme is adopted, compared with the prior art, the invention has the following advantages:
1. the bag seat and the shaft sleeve with the upper groove are formed in a split mode and are fastened and installed together in an interference fit mode, so that the shaft sleeve can be made of self-lubricating materials with low friction coefficient, the bag seat can be made of high-temperature resistant materials, the problem of wear resistance of a transmission shaft and the upper groove (the shaft sleeve) is solved, the rigidity strength of the bag seat under high pressure load in the compression and expansion motion of the bag body is ensured, the bag seat is structurally suitable for long-time use under high load, the normal and effective transmission is ensured, and the cost of parts is low as a whole;
2. the upper groove of the shaft sleeve is designed into a combined form of a conical horn mouth and a cylindrical surface counter bore, the lower groove of the eccentric wheel is designed into a combined form of a conical surface, a cylindrical surface and a plane, when the assembly is carried out, the conical surface of the lower groove of the eccentric wheel can play a role in guiding to enable the transmission shaft to quickly slide into the lower groove, the assembly is convenient, after the assembly, the outer diameter part of the lower end of the transmission shaft can be prevented from contacting the conical surface by the design of the conical surface of the lower groove of the eccentric wheel, the ball surface of the lower end of the transmission shaft contacts with the bottom of the lower groove, the ball surface of the lower end of the transmission shaft contacts with the cambered surface of the counter bore of the shaft sleeve and the transition part of the horn mouth, the ball surface of the upper end of the transmission shaft stretches into the counter bore beyond the cambered surface, the depth of the counter bore is enough to ensure that the ball surface of the upper end of the transmission shaft is not contacted with the bottom of the counter bore, so that the risk of load current rise caused by top death of the two ends of the transmission shaft is avoided, and the requirement on the press-in assembly control precision of the eccentric wheel and the motor output shaft is also reduced;
3. the middle section part of the transmission shaft and the support frame are fixed together through integral injection molding, further, a groove tangential surface with a D-shaped cross section is arranged at the middle section part of the transmission shaft, the injection molding body completely covers the D-shaped groove tangential surface, so that the torque in the circumferential direction is enhanced, the shearing strength in the axial direction is enhanced, the retention force between the support frame moving under high load for a long time and the transmission shaft is greatly improved, and the reliability of long service life of the high load is further realized; in addition, the transmission shaft adopts a D-shaped groove section, so that the cost is lower, and mass production can be realized.
The invention will be described in further detail with reference to the accompanying drawings and specific embodiments
Drawings
FIG. 1 is a combined cross-sectional view of a prior art vertical eccentric rotary diaphragm pump;
FIG. 2 is an exploded top view of a prior art vertical eccentric rotary diaphragm pump;
FIG. 3 is an exploded bottom view of a prior art vertical eccentric rotary diaphragm pump;
FIG. 4 is a combined top view of a prior art vertical eccentric rotary diaphragm pump;
FIG. 5 is an exploded cross-sectional view of FIG. 4;
FIG. 6 is an enlarged view of the transmission of FIG. 4;
FIG. 7 is a schematic view of a prior art vertical eccentric rotary diaphragm pump employing a contoured shaft;
FIG. 8 is an exploded perspective view of the transmission of the present invention;
FIG. 9 is an exploded bottom view of a vertical eccentric rotary diaphragm pump embodying the present invention;
FIG. 10 is a top plan view of a combination of a vertical eccentric rotary diaphragm pump embodying the present invention;
FIG. 11 is an exploded cross-sectional view of FIG. 10;
FIG. 12 is a sectional view of the combination of FIG. 10;
FIG. 13 is a partial schematic view of FIG. 12;
fig. 14 is a schematic structural view of the drive shaft of fig. 8-13;
FIG. 15 is a schematic view of another drive shaft of the present invention;
fig. 16 is a schematic view of a further drive shaft according to the invention.
Description of the reference numerals
The motor 10, the base 20, the eccentric wheel 30, the transmission shaft 40, the special-shaped shaft 40', the support frame 50, the capsule seat 60, the capsule body 70, the top cover 80, the lower groove a and the upper groove b
The motor 1, the base 2, the clamp spring 21, the eccentric wheel 3, the conical surface 31, the cylindrical surface 32, the plane 33, the transmission shaft 4, the groove section 41, the straight knurl 42, the key groove 43, the support frame 5, the pin hole 51, the capsule seat 6, the central hole 61, the step 611, the shaft sleeve 62, the boss 621, the conical horn mouth 63, the cylindrical surface counter bore 64, the capsule body 7, the clamping ball 71, the top cover 8, the valve seat 9, the umbrella-shaped check valve plate 91, the flat-plate check valve plate 92, the lower groove A, the upper groove B, the cambered surface C, the round corner part E, the longitudinal axis L, the included angle alpha and the included angle beta.
Detailed Description
Referring to fig. 8 to 16, the high-load long-life transmission device of the vertical eccentric rotary diaphragm pump disclosed by the invention comprises an eccentric wheel 3, a transmission shaft 4, a support frame 5, a bag seat 6 and a shaft sleeve 62. The eccentric 3 is mounted on the output shaft of the motor 1 for providing the operating power of the diaphragm pump, the output shaft of the motor 1 being located on the longitudinal axis L of the diaphragm pump, the eccentric position of the eccentric 3 forming a lower recess a. The lower end of the transmission shaft 4 is inserted into the lower groove A of the eccentric wheel 3, and the lower end of the transmission shaft 4 is contacted with the lower groove A, and the transmission shaft 4 is driven by the eccentric wheel 3 to rotate. The middle section of the transmission shaft 4 is fixed in the support frame 5, and the support frame 5 is driven by the transmission shaft 4 to rotate together with the transmission shaft 4. The capsule seat 6 for mounting the capsule 7 forms a central hole 61 at a central position, the centre line of the central hole 61 being located on the longitudinal axis L of the diaphragm pump. The shaft sleeve 62 and the bag seat 6 are formed in a split mode, the shaft sleeve 62 is fixedly arranged in the central hole 61 of the bag seat 6, and an upper groove B is formed in the center of the shaft sleeve 62. The upper end of the drive shaft 4 is inserted in the upper groove B of the sleeve 62, and the upper end of the drive shaft 4 is in contact with the upper groove B of the sleeve 62, while the rotating drive shaft 4 is supported by the inner wall of the upper groove B.
According to the invention, the bag seat 6 and the shaft sleeve 62 with the upper groove B are subjected to split injection molding, and the shaft sleeve 62 is pressed into the central hole 61 of the bag seat 6 in an interference fit mode to be fastened and installed together, so that the shaft sleeve 62 and the bag seat 6 can be respectively made of different materials, specifically, the shaft sleeve 62 can be made of self-lubricating and wear-resistant plastic materials with low friction coefficient, such as POM and PEEK, the bag seat 6 can be made of high-temperature-resistant and high-strength plastic materials, such as PPA, PA, PC containing glass fibers, so that the problem of wear resistance when the transmission shaft 4 is matched with the groove B on the shaft sleeve 62 is solved, the rigidity strength of the bag seat 6 under high-pressure load in compression and expansion movement of the bag body 7 is ensured, and the transmission device disclosed by the invention is structurally suitable for long-time use under high load, normal and effective transmission is ensured, and the cost of parts is low as a whole.
The shaft sleeve 62 of the present invention is preferably designed in such a way that the upper end of the shaft sleeve 62 is closed, the lower end of the shaft sleeve 62 forms an upper groove B, the upper groove B is provided with a conical horn 63, and the upper end of the transmission shaft 4 is contacted with the inner wall of the conical horn 63 of the shaft sleeve 62. Further, the upper groove B of the sleeve 62 is preferably shaped as: the mouth part is a conical horn mouth 63, the bottom is a cylindrical surface counter bore 64, and the inclined plane angle of the conical horn mouth 63 is larger than the inclined angle of the transmission shaft 4. After assembly, the outer diameter part of the upper end of the transmission shaft 4 is in contact with a cambered surface C at the transition part of the cylindrical surface counter bore 64 of the shaft sleeve 62 and the conical horn mouth 63, and the upper end ball head surface of the transmission shaft 4 extends into the cylindrical surface counter bore 64 beyond the cambered surface C; the depth of the cylindrical surface counter bore 64 is sufficient to ensure that the upper end ball head face of the drive shaft 4 does not contact the bottom face of the cylindrical surface counter bore 64.
In order to facilitate the assembly and firm combination of the capsule seat 6 and the shaft sleeve 62, the inner diameter of the central hole 61 of the capsule seat 6 is in a form of a large upper part, a small lower part and a step 611 in the middle, the outer diameter of the shaft sleeve 62 is also in a form of a large upper part and a small lower part, the upper part is provided with a convex wall 621, the convex wall 621 is arranged on the step 611, and the outer wall of the convex wall 621 is in interference fit with the inner wall of the upper part of the central hole 61, so that the shaft sleeve 62 is fixedly arranged in the central hole 61 of the capsule seat 6 from top to bottom.
The preferred design of the eccentric wheel 3 of the invention is that the shape of the lower groove A of the eccentric wheel 3 is as follows: the groove wall of the lower groove A close to the eccentric wheel shaft is a conical surface 31, the groove wall of the other half far away from the eccentric wheel shaft is a cylindrical surface 32, the bottom surface of the lower groove A is a plane 33, the conical surface 31 of the lower groove A of the eccentric wheel 3 is designed to avoid the contact between the outer diameter part of the lower end of the transmission shaft 4 and the conical surface 31, and the optimal design is that the central axis of the transmission shaft 4 and the side wall of the conical surface 31 of the lower groove A of the eccentric wheel 3 form an included angle beta, and the constraint of the transmission shaft is small if the included angle beta is too large and the heat dissipation and oil storage space are not good if the included angle beta is too small in consideration of the included angle beta, so that the ideal angle range of the included angle beta is 1-5 degrees. The conical surface 31 of the lower groove a of the eccentric wheel 2 can play a guiding role in assembly, so that the transmission shaft 4 can conveniently and rapidly slide into the lower groove a. After assembly, the lower end ball surface of the transmission shaft 4 is in contact with the bottom surface plane 33 of the lower groove A, and simultaneously, the lower end ball surface of the transmission shaft 4 and a rounded corner part E of the outer diameter transition of the lower end ball surface are in contact with the bottom position of the conical surface 31 of the lower groove A.
In this way, the upper groove B of the shaft sleeve 62 is designed into a combined form of the conical horn mouth 63 and the cylindrical surface counter bore 64, the lower groove A of the eccentric wheel 3 is designed into a combined form of the conical surface 31, the cylindrical surface 32 and the plane 33, the risk of load current rising caused by the top dead of two ends of the transmission shaft 4 is avoided, and the requirement on the press-in assembly control precision of the eccentric wheel 3 and the motor output shaft is also reduced.
The preferred design of the transmission shaft 4 is that the transmission shaft 4 is made of stainless steel, the support frame 5 is made of high-temperature resistant plastic, such as PPA, PA, PC containing glass fiber, and the middle section part of the transmission shaft 4 and the support frame 5 are fixed together through integral injection molding. As shown in fig. 14, the middle section of the transmission shaft 4 is further provided with a D-shaped groove tangential surface 41, when the transmission shaft 4 and the support frame 5 are integrally injection-molded and combined, the injection molding body completely covers the D-shaped groove tangential surface 41, thereby enhancing the torque in the circumferential direction and the shear strength in the axial direction, greatly improving the retention force between the support frame 5 and the transmission shaft 4 moving under long-time high load, and further realizing the reliability of high load and long service life; moreover, the transmission shaft 4 adopts the D-shaped groove section 41, so that the cost is relatively low, and mass production can be realized. The middle section of the transmission shaft 4 may also be provided with a straight knurl 42 (as shown in fig. 15) and a cross knurl or key groove 43 (as shown in fig. 16), and the middle section is completely covered by the injection molding body. The holding force between the D-shaped groove and the support frame 5 after the transmission shaft is molded is far greater than that of the knurled shaft, as shown in the following table.
As shown in fig. 13, the central axis of the transmission shaft 4 forms an angle α with the longitudinal axis (central axis of the motor 1), and it is structurally difficult to achieve considering that if the angle α is too large, the stroke is large, and if the angle α is too small, the space efficiency of the air pump is low, so that the ideal angle range of α is 11 to 15 °.
It should be noted that the transmission device of the present invention may be applied not only to the vertical eccentric rotary diaphragm pump shown in fig. 9 to 12, but also to the vertical eccentric rotary diaphragm pump shown in fig. 1 or a vertical eccentric rotary diaphragm pump of other structures, so as to replace the transmission device therein and satisfy the requirement of long-term use under high load.
As shown in fig. 9 to 12, the invention is applied to a vertical eccentric rotary diaphragm pump, a motor 1 and a base 2 are assembled together in a locking manner by screws, an output shaft of the motor is pressed into an eccentric wheel 3, a middle section of a transmission shaft 4 is integrally injection molded with a supporting frame 5, a lower end ball head surface of the transmission shaft 4 is contacted with a lower groove A of the eccentric wheel 3, an upper end of the transmission shaft 4 is contacted with an inner diameter part of a conical horn 63 of a shaft sleeve 62, the shaft sleeve 62 is sleeved at a central position of a capsule seat 6, a capsule 7 is sleeved into the capsule cavity from above the capsule seat 6, a lower clamping ball 71 of the capsule 7 is clamped and fixed by penetrating through a pulling foot hole 51 of the supporting frame 5, umbrella-shaped check valve plates 91 with clamping balls are arranged on a plurality of umbrella seats 9, upper parts of the valve seats 9 are arranged into flat check valve plates 92, the umbrella-shaped check valve plates 91 and the flat check valve plates 92 are corresponding to the capsule body 7, the valve seats 9 are assembled together after being buckled with a top cover 8 in an ultrasonic welding manner, the valve seat 9 and the top cover 8 assembly is buckled on the capsule seat 6, the capsule body 7 is pressed tightly, finally, each corner of the base 2 and each clamping spring 8 is fastened together through a plurality of clamping springs 21, and the whole pump body is fastened. Therefore, the transmission device is suitable for long-time use with high load and ensures normal and effective transmission.
The foregoing description is only of specific embodiments of the invention and is not intended to limit the scope of the invention. It should be noted that those skilled in the art who review this disclosure will recognize that many equivalent variations are possible in light of the design considerations of the present disclosure.
Claims (8)
1. High load transmission of vertical eccentric rotatory diaphragm pump, its characterized in that: the device comprises an eccentric wheel, a transmission shaft, a support frame and a bag seat, wherein the eccentric wheel is arranged on a motor output shaft for providing working power for a diaphragm pump, the motor output shaft is positioned on a longitudinal axis of the diaphragm pump, a lower groove is formed at the eccentric position of the eccentric wheel, the lower end of the transmission shaft is inserted into the lower groove of the eccentric wheel, the lower end of the transmission shaft is contacted with the lower groove and driven by the eccentric wheel to rotate, the middle section part of the transmission shaft is fixed in the support frame and drives the support frame to rotate along with the transmission shaft, the bag seat for installing the bag body is arranged at the central position to form a central hole, the central line of the central hole is positioned on the longitudinal axis of the diaphragm pump, a shaft sleeve and the bag seat are formed in a split mode, the shaft sleeve is fixedly arranged in the central hole of the bag seat, an upper groove is formed at the center of the shaft sleeve, the upper end of the transmission shaft is inserted into the upper groove of the shaft sleeve, and the upper end of the transmission shaft is contacted with the upper groove of the shaft sleeve and supported by the inner wall of the upper groove to rotate;
the upper groove of the shaft sleeve is shaped as follows: the mouth part is a conical horn mouth, the bottom is a cylindrical surface counter bore, and the inclined plane angle of the conical horn mouth is larger than the inclined angle of the transmission shaft;
the outer diameter part of the upper end of the transmission shaft is contacted with the cambered surface at the transition part of the cylindrical surface counter bore and the conical horn mouth of the shaft sleeve, and the upper end ball head surface of the transmission shaft passes through the cambered surface and stretches into the cylindrical surface counter bore; the depth of the cylindrical surface counter bore is enough to ensure that the upper end ball head surface of the transmission shaft is not contacted with the bottom surface of the cylindrical surface counter bore.
2. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 1, wherein: the shaft sleeve is made of self-lubricating and wear-resistant plastic, the bag seat is made of high-temperature and high-strength plastic, the shaft sleeve and the bag seat are in split injection molding, and the shaft sleeve is pressed into the central hole of the bag seat through interference fit.
3. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 1, wherein: the shape of the shaft sleeve is that the upper end is closed, the lower end forms an upper groove, the upper groove is provided with a conical horn mouth, and the upper end of the transmission shaft is contacted with the inner wall of the conical horn mouth of the shaft sleeve.
4. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 1, wherein: the inner diameter of the central hole of the capsule seat is in a shape of big upper part, small lower part and a step in the middle, the outer diameter of the shaft sleeve is also in a shape of big upper part and small lower part, the upper part of the shaft sleeve is provided with a convex wall, the outer wall of the convex wall is in interference fit with the inner wall of the upper part of the central hole through the convex wall arranged on the step, and the shaft sleeve is fixedly arranged in the central hole of the capsule seat from top to bottom.
5. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 1, wherein: the lower groove of the eccentric wheel is in the shape of: the groove wall of the other half close to the eccentric wheel shaft is a conical surface, the groove wall of the other half far away from the eccentric wheel shaft is a cylindrical surface, the bottom surface of the lower groove is a plane, the lower end ball head surface of the transmission shaft is in contact with the bottom surface of the lower groove, and the lower end ball head surface of the transmission shaft is in contact with the bottom part of the conical surface of the lower groove at a rounded corner part where the outer diameter part of the lower end ball head surface of the transmission shaft is in transition.
6. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 5, wherein: the central axis of the transmission shaft and the side wall of the conical surface of the lower groove of the eccentric wheel form an included angle beta of 1-5 degrees.
7. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 1, wherein: the transmission shaft is made of stainless steel, the support frame is made of high-temperature-resistant plastic, and the middle section part of the transmission shaft is fixed with the support frame through integral injection molding; the middle section part of the transmission shaft is provided with a groove tangential plane with a D-shaped section.
8. The high load transmission of a vertical eccentric rotary diaphragm pump of claim 1, wherein: the central axis of the transmission shaft forms an included angle alpha with the longitudinal axis, and the angle range of alpha is 11-15 degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010213622.8A CN111255671B (en) | 2020-03-24 | 2020-03-24 | High-load transmission device of vertical eccentric rotary diaphragm pump |
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| CN202010213622.8A CN111255671B (en) | 2020-03-24 | 2020-03-24 | High-load transmission device of vertical eccentric rotary diaphragm pump |
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| CN111255671B true CN111255671B (en) | 2023-05-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2934654Y (en) * | 2006-05-25 | 2007-08-15 | 宁波菲力嘉电器科技有限公司 | Two-part gas drum microdiaphragm pump |
| JP2009024610A (en) * | 2007-07-19 | 2009-02-05 | Mitsumi Electric Co Ltd | Small pump |
| CN102251954A (en) * | 2011-07-07 | 2011-11-23 | 广州万宝集团压缩机有限公司 | Split type cylinder seat for refrigerator compressor |
| CN108005888B (en) * | 2016-11-01 | 2019-09-17 | 厦门科际精密器材有限公司 | Piston component and pumping for pumping |
| CN207212618U (en) * | 2017-04-19 | 2018-04-10 | 朱宇霆 | A kind of improved electric motor type air pump gear |
| CN207093309U (en) * | 2017-08-29 | 2018-03-13 | 惠州市盈毅电机有限公司 | Gas liquid two purpose vavuum pump |
| CN208763861U (en) * | 2018-09-13 | 2019-04-19 | 厦门坤锦电子科技有限公司 | A kind of high life Vertical Eccentric diaphragm air pump |
| CN211924437U (en) * | 2020-03-24 | 2020-11-13 | 厦门坤锦电子科技有限公司 | High-load long-service-life transmission device of vertical eccentric rotary diaphragm pump |
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