Abstract: A filter medium contamination detection structure may comprise a filter element and a prompt assembly. The prompt assembly may comprise a first pressure sensor, which may comprise a signal output end, and a second pressure sensor, which may comprise a signal output end. The first pressure sensor may be connected to a water inlet of the filter element, and the second pressure sensor may be connected to a water outlet of the filter element or outside air. The signal output ends of the first pressure sensor and the second pressure sensor may be connected to a signal input end of a controller. When the filter element is dirty, a pressure at the water inlet end may increase or a pressure at the water outlet end may decrease, and the difference between the first sensor and the second pressure sensor may increase.

Abstract: A contamination prompt structure for a filter medium may comprise a filter element and a prompt assembly. The prompt assembly may have a movable part. One end of the movable part may be in communication with one of a water inlet of the filter element, or a water outlet of the filter element, and the other end of the movable part may be in communication with the other one of the water inlet of the filter element, the water outlet of the filter element, or outside air. When the filter element is in a contaminated state, a rise of pressure at the water inlet or a drop of pressure at the water outlet may drive the movable part to move to send a prompt for a user to replace the filter element.

Abstract: An air pump assembly for an inflatable product may include a housing, a cover coupled to the housing, and a rotatable assembly supported by the housing. The rotatable assembly may include a pump housing having first and second air vents, an impeller positioned within the pump housing, a motor operatively coupled to the impeller, and a rotary disc positioned between the pump housing and a vent hole of the housing. The rotatable assembly may be rotatable to a first position wherein air flows from the first air vent of the pump housing to the second air vent of the pump housing and through the vent hole in the housing into an interior of the inflatable product and a second position wherein air flows from the interior of the inflatable product through the vent hole in the housing into the first air vent and then to the second air vent.

Abstract: An adjustable attachment structure for a swimming machine is disclosed. The attachment structure is configured to interact with a frame of a pool. A user may interact with a locking switch to transition the attachment structure between a locked and an unlocked state. In the unlocked state, the swimming machine may be rotated about an axis to direct a generated current in a number of directions.

Abstract: A high and low-pressure integrated air pump includes a single housing including an air inlet and an air outlet. A high-pressure pump is disposed within the housing and in fluid communication with the air inlet, and uses a first outlet passage to discharge to the air outlet. A low-pressure pump is also disposed within the housing and in fluid communication with the air inlet, and uses a second outlet passage to discharge to the air outlet.

Abstract: An air pump assembly (100) for an inflatable product (10) having an interior (12) is provided. The air pump assembly (100) may comprise a housing (120) having a vent hole (200) in fluid communication with the interior (12) of the inflatable product (10). The air pump assembly (100) may further comprise a cover (240) coupled to the housing. The cover may include a plurality of vent openings (244). The air pump assembly (100) may further comprise a rotatable assembly (104) supported by the housing (120). The rotatable assembly (104) may comprise a pump housing (112) having a first air vent (136) and a second air vent (138); an impeller (114) positioned in the pump housing; and a motor (110) operatively coupled to the impeller to drive a rotation of the impeller.

Abstract: An inflatable product can be inflated to a low pressure by a lower-power but high-volume electric pump, then “firmed” or fully inflated by an auxiliary pump. The auxiliary pump may be manually powered, such that the overall cost and complexity of the electric and auxiliary pumps are still lower than a high-power electric pump. The low power high volume electric pump can be easily powered by small batteries that will also provide an increased number of inflations compared to traditional high-power pumps for a given battery capacity. Using small batteries allows the pump to be very compact in size. The auxiliary pump may work through an auxiliary air chamber within the primary air chamber and fluidly connected thereto by a check valve. The electric pump may be reversible to provide for both inflation and deflation.

Abstract: A high and low-pressure integrated air pump includes a single housing including an air inlet and an air outlet. A high-pressure pump is disposed within the housing and in fluid communication with the air inlet, and uses a first outlet passage to discharge to the air outlet. A low-pressure pump is also disposed within the housing and in fluid communication with the air inlet, and uses a second outlet passage to discharge to the air outlet.

Abstract: An adjustable attachment structure for a swimming machine is disclosed. The attachment structure is configured to interact with a frame of a pool. A user may interact with a locking switch to transition the attachment structure between a locked and an unlocked state. In the unlocked state, the swimming machine may be rotated about an axis to direct a generated current in a number of directions.

Abstract: An adjustable attachment structure for a swimming machine is disclosed. The attachment structure is configured to interact with a frame of a pool. A user may interact with a locking switch to transition the attachment structure between a locked and an unlocked state. In the unlocked state, the swimming machine may be rotated about an axis to direct a generated current in a number of directions.

Abstract: A high and low-pressure integrated air pump includes a single housing including an air inlet and an air outlet. A high-pressure pump is disposed within the housing and in fluid communication with the air inlet, and uses a first outlet passage to discharge to the air outlet. A low-pressure pump is also disposed within the housing and in fluid communication with the air inlet, and uses a second outlet passage to discharge to the air outlet.

Abstract: An inflatable product can be inflated to a low pressure by a lower-power but high-volume electric pump, then “firmed” or fully inflated by an auxiliary pump. The auxiliary pump may be manually powered, such that the overall cost and complexity of the electric and auxiliary pumps are still lower than a high-power electric pump. The low power high volume electric pump can be easily powered by small batteries that will also provide an increased number of inflations compared to traditional high-power pumps for a given battery capacity. Using small batteries allows the pump to be very compact in size. The auxiliary pump may work through an auxiliary air chamber within the primary air chamber and fluidly connected thereto by a check valve. The electric pump may be reversible to provide for both inflation and deflation.