Diaphragm pump

• US 6,655,257 B1
• Filed: 08/14/2001
• Issued: 12/02/2003
• Est. Priority Date: 02/16/1999
• Status: Expired due to Term

• Current Assignee: KNF Flodos AG
• Original Assignee: KNF Flodos AG
• Inventors: Meyer, André
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): LESLIE, MICHAEL S
• Application Number:
  US09/913,449
• Time in Patent Office: 840 Days
• Field of Search: 92/96, 92/97, 92/98.R, 92/99, 921/00, 921/01, 921/02, 417/413.1
• US Class Current: 92/99
• CPC Class Codes: F04B 43/0054 particularities of the flexible members

Abstract

A diaphragm pump with a diaphragm (1) of elastic material, which includes a receiving cavity (4) in a reinforced central area (3) for a connecting rod head (5) of a connecting rod which displaces the diaphragm (1). The diaphragm (1) includes a clamping rim (2) for securing the diaphragm to the pump housing. On the upper side (8) of the diaphragm (1) which is proximal to the pump chamber, at least one circularly disposed rib (9) is provided essentially radially outward from and proximal to a central area (3) which area is bounded by the outline of the connecting rod head (5) or by the outline of a part of the diaphragm (1) near to the said connecting rod head (5). A plurality of ribs (9), spaced in a radial direction one from the other are provided and are located where the forces introduced by the connecting rod head (5) spread into the radial, neighboring ring area of the diaphragm.

Claims

1. A diaphragm pump comprising a diaphragm (1) comprised of elastic material having a reinforced central area (3) with a receiving cavity (4) for a connecting rod head (5) of a connecting rod which displaces the diaphragm (1) between a top and a bottom dead center point, the diaphragm (1) is secured by a clamping rim (2) on an outer periphery thereof to the pump housing, wherein on an upper side (8) of the diaphragm (1) which is proximal to a chamber of the pump, at least one circularly disposed rib (9) is provided on the upper side (8) located radially outward from and proximal to a central area (3) bounded by an outline of the connecting rod head (5) or by an outline of a part of the diaphragm (1) near the connecting rod head (5).

2. A diaphragm pump in accordance with claim 1, wherein a plurality of ribs (9) are provided, which are placed proximal to the central area (3) and spaced from one another in a radial direction.

3. A diaphragm pump in accordance with claim 2, wherein the plurality of ribs (9) which are spaced from one another in a radial direction have a spacing that is smaller in an area of the central area (3) than a spacing further out in a radial direction.

4. A diaphragm pump in accordance with claim 1, wherein the plurality of spaced ribs are spaced from one another in a radial direction, with the spacing between the neighboring ribs being approximately equal.

5. A diaphragm pump in accordance with claim 1, wherein the ribs are concentrically arranged and have a circularly rounded profile.

6. A diaphragm pump in accordance with claim 1, wherein the ribs (9) have an oval or elliptical form, with minor axes thereof lying in a plane of the connecting rod movement.

7. A diaphragm pump in accordance with claim 1, wherein the diaphragm (1) has an underside (10) which is essentially smooth.

8. A diaphragm pump in accordance with claim 1, wherein the at least one rib has a round or rounded cross-section, and

a transition from the at least one rib to a bordering diaphragm surface is rounded off.

9. A diaphragm pump in accordance with claim 1, wherein the diaphragm (1) is made of rubber or a rubber-elastic raw material and the diaphragm (1) may have a PTFE surface coating.

10. A diaphragm pump in accordance with claim 1, wherein the diaphragm includes a net-type reinforcing layer located between the upper side (8) and the connecting rod end (5) that is located proximal to the upper side (8).