# US 11,905,942 B2 · Booster pump and water purification device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,905,942 B2 - Document ID: US11905942B2 - Status: Granted - Kind: B2 - Application number: 17/295,423 - Filed: 2019-12-03 - Published: 2022-01-13 - Granted: 2024-02-20 - Earliest claimed: 2018-12-03 - Assignees: Guangdong Midea White Home Appliance Technology Innovation Center Co., Ltd.; Midea Group Co., Ltd. - Applicants: Guangdong Midea White Home Appliance Technology Innovation Center Co., Ltd.; Midea Group Co., Ltd. - Inventors: Zhihua Wen; Fangzhen Zheng - Web page: https://patentgrep.com/patent/US11905942B2 ## CPC - F04B 43/04: Pumps having electric drive - C02F 1/001: {Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00)} - F04B 43/026: {each plate-like pumping flexible member working in its own pumping chamber} - F04B 53/001: {Noise damping} - F04B 53/14: Pistons, piston-rods or piston-rod connections - F04B 53/16: Casings; Cylinders; Cylinder liners or heads; Fluid connections - C02F 2201/002: Construction details of the apparatus - F05B 2210/11: liquid, i.e. incompressible - 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) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G ## Abstract A booster pump and a water purification device. The booster pump comprises: a pump body having an installation chamber extending in a first direction; a motor disposed in the installation chamber, the motor comprising a motor body and a motor shaft passing through two ends of the motor body in the first direction; and a first pump head and a second pump head respectively installed at two ends of the pump body in the first direction, two ends of the motor shaft being drivingly connected to the first pump head and the second pump head, respectively. ## Claims ### Claim 1 A booster pump, comprising: a pump body provided with a mounting cavity extending in a first direction; a motor arranged in the mounting cavity, wherein the motor comprises a motor body, and a motor shaft passing through both ends of the motor body in the first direction; and a first pump head and a second pump head, wherein the first pump head is mounted on a first end of the pump body in the first direction and drivingly connected to a first end of the motor shaft, and the second pump head is mounted on a second end of the pump body in the first direction and drivingly connected to a second end of the motor shaft; wherein each of the first pump head and the second pump head is provided with a piston plate, the first and second ends of the motor shaft is connected to the corresponding piston plate of the piston plates, each of the piston plates is formed with at least two piston chambers, each piston chamber communicates with a water intake end and a water drain end of the corresponding pump head, and the piston chambers are uniformly arranged around a center of the corresponding piston plate; wherein a projection of the piston chambers of the first pump head and a projection of the piston chambers of the second pump head are misaligned with each other in a projection plane perpendicular to the first direction. ### Claim 2 (depends on 1) The booster pump of claim 1, wherein a number of the piston chambers of the first pump head is the same as a number of the piston chambers of the second pump head, and wherein an angle between two adjacent piston chambers of the first pump head or the second pump head is defined as a, and a misalignment angle between a projection of each of the piston chambers of the first pump head and a projection of the corresponding piston chamber of the piston chambers of the second pump head in the projection plane is defined as β, wherein α and β satisfy a relation of: β=α/2. ### Claim 3 (depends on 1) The booster pump of claim 1, wherein a number of the piston chambers of the first pump head is the same as a number of the piston chambers of the second pump head, and wherein an angle between two adjacent piston chambers of the first pump head or the second pump head is defined as α, and a misalignment angle between a projection of each of the piston chambers of the first pump head and a projection of a corresponding piston chamber of the piston chambers of the second pump head in the projection plane is defined as β, wherein α and β satisfy a relation of: β=α/4. ### Claim 4 (depends on 2) The booster pump of claim 2, wherein each of the first pump head and the second pump head is provided with three piston chambers, and α satisfies a relation of: α=120°. ### Claim 5 (depends on 1) The booster pump of claim 1, wherein a number of the piston chambers of the first pump head is the same as a number of the piston chambers of the second pump head, and an operating interval between the first pump head and the second pump head is set at a preset central angle. ### Claim 6 (depends on 5) The booster pump of claim 5, wherein a misalignment angle between a projection of each of the piston chambers of the first pump head and a projection of a corresponding piston chamber of the piston chambers of the second pump head in a projection plane perpendicular to the first direction is defined as β, and the preset central angle is defined as γ, wherein β and γ satisfy a relation of: γ=β/2. ### Claim 7 (depends on 6) The booster pump of claim 6, wherein β satisfies a relation of: β=60°. ### Claim 8 (depends on 5) The booster pump of claim 5, wherein a first flat surface for driving the first pump head is arranged on a peripheral surface of the first end of the motor shaft, a second flat surface for driving the second pump head is arranged on a peripheral surface of the second end of the motor shaft, and a normal angle between the first flat surface and the second flat surface is equal to the preset central angle. ### Claim 9 (depends on 1) The booster pump of claim 1, wherein an interval between projections of any two adjacent piston chambers is regular. ### Claim 10 (depends on 1) The booster pump of claim 1, wherein a first membrane is arranged on an inner side of a water inlet of each piston chamber, and a second membrane is arranged on an outer side of a water outlet of each piston chamber, and wherein the motor is a dual-shaft motor, the first and second ends of the motor shaft of the motor being connected to the first membrane through an inclined bushing to drive the first membrane into a push and pull motion in an axial direction. ### Claim 11 (depends on 1) The booster pump of claim 1, wherein each of the first pump head and the second pump head forms a hollow discoid shape. ### Claim 12 A water purification device, comprising a booster pump, wherein the booster pump comprises: a pump body provided with a mounting cavity extending in a first direction; a motor arranged in the mounting cavity, wherein the motor comprises a motor body, and a motor shaft passing through both ends of the motor body in the first direction; and a first pump head and a second pump head, wherein the first pump head is mounted on a first end of the pump body in the first direction and drivingly connected to a first end of the motor shaft, and the second pump head is mounted on a second end of the pump body in the first direction and drivingly connected to a second end of the motor shaft; wherein each of the first pump head and the second pump head is provided with a piston plate, the first and second ends of the motor shaft is connected to the corresponding piston plate of the piston plates, each of the piston plates is formed with at least two piston chambers, each piston chamber communicates with a water intake end and a water drain end of the corresponding pump head, and the piston chambers are uniformly arranged around a center of the corresponding piston plate; wherein a projection of the piston chambers of the first pump head and a projection of the piston chambers of the second pump head are misaligned with each other in a projection plane perpendicular to the first direction. ### Claim 13 (depends on 12) The water purification device of claim 12, wherein the water purification device is a water purifier; or the water purification device is an automatic filter.