DIAPHRAGM PUMP

• US 20120315166A1
• Filed: 06/11/2012
• Published: 12/13/2012
• Est. Priority Date: 06/10/2011
• Status: Active Grant

• Current Assignee: Johnson Electric International AG (Johnson Electric Holdings Limited)
• Original Assignee: Johnson Electric SA (Johnson Electric Holdings Limited)
• Inventors: Looi, Wan Hor, Zeng, Hong Yi, Cuaresma, Samuel Agustin Jr.
• Granted Patent: US 9,217,425 B2
• Time in Patent Office: Days
• US Class Current: 417/413.1
• CPC Class Codes: F04B 43/0045 with a number of independent working chambers which are actuated successively by one mechanism
• CPC Class Codes: F04B 43/026 each plate-like pumping flexible member working in its own pumping chamber
• CPC Class Codes: F04B 45/022 with two or more bellows in parallel
• CPC Class Codes: F04B 45/027 having electric drive
• CPC Class Codes: F04B 45/043 two or more plate-like pumping flexible members in parallel
• CPC Class Codes: F04B 45/047 Pumps having electric drive
• CPC Class Codes: F04B 9/045 the means being eccentrics

Abstract

A diaphragm pump includes a motor, an eccentric member driven by the motor, and a diaphragm. The motor includes an output shaft connected with the eccentric member. The eccentric member includes multiple arms which move up and down due to the rotation of the output shaft. The diaphragm has multiple bladders. Each bladder forms a pump chamber. The bladders are connected with the arms such that the bladders are compressed or expanded due to the movement of the arms. The pump has an air exhaust chamber and an air inlet chamber. The air inlet chamber is connected to the pump chambers via a passage. The passage includes a cavity which overlaps the air exhaust chamber in an axial direction of the motor.

Claims

1. A diaphragm pump comprising:

a motor comprising an output shaft;

an eccentric member driven by the output shaft, the eccentric member comprising a plurality of arms moving up and down due to rotation of the output shaft;

a diaphragm comprising a plurality of bladders, each of the bladders forming a pump chamber, the bladders being connected with arms of the eccentric member, respectively, such that the pump chambers are compressed and expanded due to movement of the arms;

an air exhaust chamber communicating with the pump chambers via channels;

a plurality of first valves arranged to control the flow of air through the channels;

an air inlet chamber communicating with the pump chambers via a passage;

a cavity forming a part of the passage; and

a plurality of second valves arranged to control the flow of air into the pump chambers from the cavity.

2. The pump of claim 1, wherein the passage extends from the air inlet chamber to the cavity along a first direction initially and then from the cavity to the pump chambers along a second direction substantially opposite to the first direction.

3. The pump of claim 1, wherein the cavity at least partially overlaps the air exhaust chamber in an axial direction of the motor.

4. The pump of claim 1, wherein a plurality of mounting holes are formed in sidewalls that define the air inlet chamber and the air exhaust chamber, the mounting holes form pathways, which forms a part of the passage between the air inlet chamber and the cavity.

5. The pump of claim 4, further comprising:

a base, a holder, an air guide plate and a casing, wherein the base and the holder cooperatively define the air inlet chamber, the air guide plate and the casing cooperatively define the air exhaust chamber, and the pathways pass through the holder, the air guide plate and the casing.

6. The pump of claim 5, further comprising a cover plate covering one side of the casing, the cover plate and the casing cooperatively defining the cavity.

7. The pump of claim 6, wherein the casing and the air guide plate each define though holes forming a part of the passage and arranged to communicate the cavity with the pump chambers.

8. The pump of claim 7, wherein the second valves are disposed between the casing and the air guide plate.

9. The pump of claim 8, further comprising a seal mounted to a surface of the air guide plate, and the second valves are formed by the seal.

10. The pump of claim 9, wherein the air inlet chamber is disposed between the motor and the air guide plate, the exhaust chamber is disposed on the side of the air guide plate remote from the motor and the cavity is disposed on the side of the exhaust chamber remote from the motor, the cavity being connected to the air inlet chamber by at least three pathways passing through the mounting holes.

11. A diaphragm pump comprising:

a motor comprising an output shaft;

an eccentric member driven by the output shaft of the motor, the eccentric member comprising a plurality of arms that move up and down by rotation of the output shaft;

a diaphragm comprising a plurality of bladders, each of the bladders forming a pump chamber, the bladders being connected with the arms of the eccentric member, respectively, such that the pump chambers are compressed and expanded by movement of the arms;

an air exhaust chamber communicating with the pump chambers via a channel; and

an air inlet chamber separate from the air exhaust chamber, the air inlet chamber communicating with the pump chamber via a passage, the passage at least partially overlapping the air exhaust chamber in an axial direction of the motor.

12. A diaphragm pump comprising:

a motor comprising an output shaft;

an eccentric member driven by the output shaft of the motor, the eccentric member comprising a plurality of arms that move up and down due to rotation of the output shaft;

a diaphragm comprising a plurality of bladders, each of the bladders defining a pump chamber, the bladders being connected with the arms of the eccentric member, respectively, such that the pump chambers are compressed and expanded by movement of the arms;

an air exhaust chamber communicating with the pump chamber of each bladder via a channel;

an air inlet chamber separate from the air exhaust chamber, the air inlet chamber communicating with the pump chamber via a passage and accommodating the eccentric member; and

a cavity disposed adjacent the air exhaust chamber on a side remote from the air inlet chamber, the cavity forming a part of the passage.