One piece diaphragm
Illustrative embodiments of diaphragm assemblies for diaphragm pumps and methods for manufacturing such diaphragm assemblies are disclosed. In at least one illustrative embodiment, a diaphragm pump may include an inflexible central core and a flexible diaphragm body surrounding the inflexible central core. The inflexible central core may include a reinforced thermoplastic and the flexible diaphragm body may include a thermoplastic elastomer. The flexible diaphragm body is bonded directly to the inflexible central core. The diaphragm assembly may include a mounting bolt having a head end and a threaded end. The inflexible central core surrounds the head end of the mounting bolt and the threaded end of the mounting bolt extends outside of the inflexible central core. The inflexible central core may include multiple raised features that cooperate to define cavities in the inflexible central core. The flexible diaphragm body fills the cavities of the inflexible central core.
1. A diaphragm assembly for a diaphragm pump, the diaphragm assembly comprising:
an inflexible central core;
a flexible diaphragm body surrounding the inflexible central core,
wherein the flexible diaphragm body comprises an elastomer, and wherein the flexible diaphragm body is bonded directly to the inflexible central core;
wherein the inflexible central core comprises a reinforced polymeric material and the flexible diaphragm body comprises a thermoplastic elastomer; and
wherein the inflexible central core comprises reinforced polybutylene terephthalate, and the flexible diaphragm body comprises a thermoplastic copolyester elastomer.
2. The diaphragm assembly of claim 1 , wherein the reinforced polybutylene terephthalate comprises glass filled polybutylene terephthalate.
3. The diaphragm assembly of claim 1 , further comprising an attachment member having a first end and a second end, wherein the inflexible central core is molded around the first end of the attachment member and the second end of the attachment member extends outside of the inflexible central core and the flexible diaphragm body.
4. The diaphragm assembly of claim 3 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
5. The diaphragm assembly of claim 1 , wherein the inflexible central core comprises a re-melt zone at an interface between the inflexible central core and the flexible diaphragm body, wherein the re-melt zone includes a mixture of the reinforced polymeric material and the thermoplastic elastomer.
6. The diaphragm assembly of claim 1 , wherein the inflexible central core comprises a generally domed pumped media chamber side and a motive fluid chamber side, wherein the inflexible central core includes a concave opening toward the motive fluid chamber side.
7. The diaphragm assembly of claim 6 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
8. The diaphragm assembly of claim 1 ,
wherein the inflexible central core comprises a pumped media chamber side and a motive fluid chamber side and a plurality of openings between the motive fluid chamber side and the pumped media chamber side;
wherein the motive fluid chamber side comprises a plurality of raised features that cooperate to define a plurality of cavities in the inflexible central core;
wherein the flexible diaphragm body fills the plurality of cavities of the inflexible central core; and
wherein the raised plurality of features of the motive fluid chamber side comprise a plurality of spokes and a plurality of concentric ridges that define the plurality of cavities in the inflexible central core.
9. The diaphragm assembly of claim 8 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
10. The diaphragm assembly of claim 1 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
11. A diaphragm assembly for a diaphragm pump, the diaphragm assembly comprising:
an inflexible central core;
a flexible diaphragm body surrounding the inflexible central core,
wherein the flexible diaphragm body comprises an elastomer, and wherein the flexible diaphragm body is bonded directly to the inflexible central core;
wherein the inflexible central core comprises a reinforced polymeric material and the flexible diaphragm body comprises a thermoplastic elastomer; and
wherein the inflexible central core comprises reinforced polypropylene or polyamide, and the flexible diaphragm body comprises a thermoplastic vulcanizate.
12. The diaphragm assembly of claim 11 , wherein the reinforced polypropylene comprises long glass filled polypropylene.
13. The diaphragm assembly of claim 11 , further comprising an attachment member having a first end and a second end, wherein the inflexible central core is molded around the first end of the attachment member and the second end of the attachment member extends outside of the inflexible central core and the flexible diaphragm body.
14. The diaphragm assembly of claim 13 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
15. The diaphragm assembly of claim 11 , wherein the inflexible central core comprises a re-melt zone at an interface between the inflexible central core and the flexible diaphragm body, wherein the re-melt zone includes a mixture of the reinforced polymeric material and the thermoplastic elastomer.
16. The diaphragm assembly of claim 11 , wherein the inflexible central core comprises a generally domed pumped media chamber side and a motive fluid chamber side, wherein the inflexible central core includes a concave opening toward the motive fluid chamber side.
17. The diaphragm assembly of claim 16 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
18. The diaphragm assembly of claim 11 ,
wherein the inflexible central core comprises a pumped media chamber side and a motive fluid chamber side and a plurality of openings between the motive fluid chamber side and the pumped media chamber side;
wherein the motive fluid chamber side comprises a plurality of raised features that cooperate to define a plurality of cavities in the inflexible central core;
wherein the flexible diaphragm body fills the plurality of cavities of the inflexible central core; and
wherein the raised plurality of features of the motive fluid chamber side comprise a plurality of spokes and a plurality of concentric ridges that define the plurality of cavities in the inflexible central core.
19. The diaphragm assembly of claim 18 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
20. The diaphragm assembly of claim 11 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
21. A diaphragm assembly for a diaphragm pump, the diaphragm assembly comprising:
an inflexible central core;
a flexible diaphragm body surrounding the inflexible central core,
wherein the flexible diaphragm body comprises an elastomer, and wherein the flexible diaphragm body is bonded directly to the inflexible central core;
wherein the inflexible central core comprises a reinforced polymeric material and the flexible diaphragm body comprises a thermoplastic elastomer; and
wherein the inflexible central core comprises reinforced polyvinylidene fluoride, and the flexible diaphragm body comprises flexible polyvinylidene fluoride.
22. The diaphragm assembly of claim 21 , further comprising an attachment member having a first end and a second end, wherein the inflexible central core is molded around the first end of the attachment member and the second end of the attachment member extends outside of the inflexible central core and the flexible diaphragm body.
23. The diaphragm assembly of claim 22 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
24. The diaphragm assembly of claim 21 , wherein the inflexible central core comprises a re-melt zone at an interface between the inflexible central core and the flexible diaphragm body, wherein the re-melt zone includes a mixture of the reinforced polymeric material and the thermoplastic elastomer.
25. The diaphragm assembly of claim 21 , wherein the inflexible central core comprises a generally domed pumped media chamber side and a motive fluid chamber side, wherein the inflexible central core includes a concave opening toward the motive fluid chamber side.
26. The diaphragm assembly of claim 25 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
27. The diaphragm assembly of claim 21 ,
wherein the inflexible central core comprises a pumped media chamber side and a motive fluid chamber side and a plurality of openings between the motive fluid chamber side and the pumped media chamber side;
wherein the motive fluid chamber side comprises a plurality of raised features that cooperate to define a plurality of cavities in the inflexible central core;
wherein the flexible diaphragm body fills the plurality of cavities of the inflexible central core; and
wherein the raised plurality of features of the motive fluid chamber side comprise a plurality of spokes and a plurality of concentric ridges that define the plurality of cavities in the inflexible central core.
28. The diaphragm assembly of claim 27 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.
29. The diaphragm assembly of claim 21 , wherein the flexible diaphragm body is over-molded on the inflexible central core, the inflexible central core being preheated to a predetermined temperature approaching the glass-transition temperature of the reinforced polymeric material before being overmolded with the thermoplastic elastomer.