# US 2018/0320683 A1 · Diaphragm pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320683 A1 - Document ID: US20180320683A1 - Status: Published application - Kind: A1 - Application number: 15/641,857 - Filed: 2017-07-05 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: Taiko Investment Co., Ltd. - Applicants: Taiko Investment Co., Ltd. - Inventors: Pohan Chang - Web page: https://patentgrep.com/patent/US20180320683A1 ## CPC - F04B 43/04: Pumps having electric drive - F04B 9/02: the means being mechanical - F04B 17/03: driven by electric motors - F04B 49/06: Control using electricity (regulating by means of floats actuating electric switches F04B49/04) - F04B 49/20: by changing the driving speed - G01P 3/36: Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light (G01P3/68 takes precedence; gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams G01C19/64) - F04B 2203/0209: Rotational speed - G01B 11/00: Measuring arrangements characterised by the use of optical techniques - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS ## Abstract A diaphragm pump includes a driving assembly including a base seat and an electric motor provided to the base seat; a pump body connected to the base seat so as to define a chamber; a connecting rod assembly disposed in the chamber and including an eccentric wheel connected with an electric motor shaft of the electric motor; a photoelectric shielding sheet separately provided to the eccentric wheel and configured to rotate synchronously with the eccentric wheel and the electric motor shaft; and a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft and send a detected signal to an electric motor controller. The electric motor controller adjusts the rotational speed of the electric motor shaft of the electric motor according to the detected signal. ## Claims ### Claim 1 A diaphragm pump comprising: a driving assembly comprising a base seat and an electric motor provided to the base seat; a pump body connected to the base seat so as to define a chamber; a connecting rod assembly disposed in the chamber and comprising an eccentric wheel connected with an electric motor shaft of the electric motor; a photoelectric shielding sheet separately provided to the eccentric wheel and configured to rotate synchronously with the eccentric wheel and the electric motor shaft; and a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft and send a detected signal to an electric motor controller, the electric motor controller being configured to adjust the rotational speed of the electric motor shaft of the electric motor according to the detected signal. ### Claim 2 (depends on 1) The diaphragm pump according to claim 1, wherein the photoelectric shielding sheet is detachably disposed to the eccentric wheel. ### Claim 3 (depends on 2) The diaphragm pump according to claim 2, wherein the photoelectric shielding sheet extends outwards along a radial direction of the eccentric wheel. ### Claim 4 (depends on 3) The diaphragm pump according to claim 3, wherein the eccentric wheel is provided with a first connecting member, the photoelectric shielding sheet is provided with a second connecting member, and the first connecting member and the second connecting member are fitted with each other so that the photoelectric shielding sheet is connected to the eccentric wheel. ### Claim 5 (depends on 4) The diaphragm pump according to claim 4, wherein the first connecting member is configured as a positioning hole and the second connecting member is configured as a positioning pillar. ### Claim 6 (depends on 3) The diaphragm pump according to claim 3, wherein the photoelectric shielding sheet comprises: a positioning portion provided closely to an upper surface of the eccentric wheel; and a shielding portion connected to the positioning portion and extending radially outwards. ### Claim 7 (depends on 6) The diaphragm pump according to claim 6, wherein the shielding portion is configured as a fan shape. ### Claim 8 (depends on 1) The diaphragm pump according to claim 1, further comprising a counterweight member mounted to the photoelectric shielding sheet. ### Claim 9 (depends on 8) The diaphragm pump according to claim 8, wherein the counterweight member is configured as a screw, and the photoelectric shielding sheet is provided with a threaded hole fitted with the screw. ### Claim 10 (depends on 1) The diaphragm pump according to claim 1, further comprising a printed circuit board wherein the printed circuit board is provided to the base seat and connected with the photoelectric sensor; the printed circuit board is provided with a lead wire connector, and a lead wire is electrically connected to the printed circuit board through the lead wire connector; one of the lead wire and the lead wire connector is provided with a lead wire plug, the other one of the lead wire and the lead wire connector is provided with a lead wire jack, and the lead wire plug is plugged into the lead wire jack. ### Claim 11 (depends on 10) The diaphragm pump according to claim 10, wherein the lead wire connector is provided with the lead wire jack, the lead wire is provided with the lead wire plug, and the lead wire is plugged in the lead wire jack through the lead wire plug.