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US 12,276,272 B2Granted
Diaphragm pump
OwnerYushi Maruyama, Toshihisa Nemotoinventors
Life of this patent
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Abstract
A diaphragm pump includes a low pressure side diaphragm forming a part of a pulsation operating chamber, a high pressure side diaphragm forming a part of a pump chamber, and a connecting portion connecting the low pressure side diaphragm and the high pressure side diaphragm. The high pressure side diaphragm operates in conjunction with the low pressure side diaphragm by being connected to the low pressure side diaphragm by the connecting portion. An area of a high pressure side operating portion of the high pressure side diaphragm is smaller than an area of a low pressure side operating portion of the low pressure side diaphragm.
Claims20
A diaphragm pump that operates by receiving a pulsating pressure in a crank chamber of an engine, the diaphragm pump comprising:
- a low pressure side diaphragm forming a part of a pulsation operating chamber and configured to receive the pulsating pressure, wherein the low pressure side diaphragm includes a low pressure side operating portion that is configured to operate in response to receiving the pulsating pressure, and an annular low pressure side movable portion;
- a low pressure side backup attached to and configured to support the low pressure side operating portion, wherein the annular low pressure side movable portion is located around the low pressure side backup;
- a high pressure side diaphragm forming a part of a pump chamber and configured to send fuel to the engine, wherein the high pressure side diaphragm includes a high pressure side operation portion and an annular high pressure side movable portion;
- a high pressure side backup attached to and configured to support the high pressure side operating portion, wherein the annular high pressure side movable portion is located around the high pressure side backup;
- and
- a connecting portion connecting the low pressure side diaphragm and the high pressure side diaphragm to each other,
- wherein the high pressure side diaphragm operates in conjunction with the low pressure side diaphragm by being connected to the low pressure side diaphragm by the connecting portion,
- wherein an area of the high pressure side operating portion is smaller than an area of the low pressure side operating portion, and
- wherein a width of the annular low pressure side movable portion in a radial direction of the annular low pressure side movable portion is smaller than a width of the annular high pressure side movable portion in a radial direction of the annular high pressure side movable portion.
6 more elements
A diaphragm pump comprising:
- a first operating chamber;
- a second operating chamber;
- a first diaphragm located in the first operating chamber and including a first surface area that is configured to receive a pulsating pressure, and a first annular movable portion;
- a first support member fixed to the first surface area and configured to transmit the pulsating pressure to the first surface area, wherein the first annular movable portion of the first diaphragm is located around the first support member;
- a second diaphragm located in the second operating chamber and including a second surface area in contact with fuel for an engine, and a second annular movable portion;
- a second support member fixed to the second surface area and located between the second surface area and the fuel, wherein the second annular movable portion of the second diaphragm is located around the second support member;
- and
- a connecting portion connecting the first diaphragm and the second diaphragm, and configured to operate the second diaphragm to send the fuel to the engine in response to the first diaphragm receiving the pulsating pressure,
- wherein the second surface area is smaller than the first surface area, and
- wherein a width of the first annular movable portion in a radial direction of the first annular movable portion is smaller than a width of the second annular movable portion in a radial direction of the second annular movable portion.
7 more elements
A diaphragm pump comprising:
- a first operating chamber;
- a second operating chamber located adjacent to the first operating chamber;
- a first diaphragm located in the first operating chamber;
- a second diaphragm located in the second operating chamber;
- a connecting portion connecting the first diaphragm and the second diaphragm, and configured to operate the second diaphragm in response to the first diaphragm receiving a pulsating pressure;
- and
- a wall portion located between the first operating chamber and the second operating chamber in a movement direction of the connecting portion,
- wherein the wall portion comprises a guide hole which contacts and guides the connecting portion through the wall portion in the movement direction of the connecting portion,
- wherein the first diaphragm includes a first surface area facing away from the second operating chamber,
- wherein the second diaphragm includes a second surface area facing away from the first operating chamber, and
- wherein the second surface area is smaller than the first surface area.
8 more elements
Dependencies are inferred from the claim text.