A precision volumetric pump with a bellows hermetic seal provides compliance time performance comparable to a conventional pump having a dynamic seal. However, the precision volumetric pump with a bellows hermetic seal is enabled to operate over a very long service life with minimal or no maintenance without a propensity to develop leaks over the long service life.

Start-stop engine systems for a turbocharged engine have a bypass with fluid flow from upstream of the compressor or downstream of the compressor to a position between the throttle and the engine, or from between the compressor and throttle to a position upstream of the compressor with a Venturi device in the bypass. A device requiring vacuum is in fluid communication with a suction port of the Venturi device. An electronic vacuum pump is added that is in fluid communication with the device requiring vacuum or with the Venturi device. The electronic vacuum pump is operated during a stop condition of the start-stop engine to replace the vacuum generated by the Venturi device or to provide a pressure drop across the Venturi device so the Venturi device continues to generate vacuum for the device requiring vacuum.

A pneumatic elastic band comprises an outer portion, an inflatable portion and a nozzle. The outer portion has a strip-shaped structure with elasticity. The inflatable portion comprises a plurality of expansion portions and a plurality of communication portions. Each of the communication portions is connected between two of the expansion portions adjacent to each other for defining a plurality of gaps. The nozzle is disposed on a surface of the outer portion and communicated with the inflatable portion. When a gas is guided into the inflatable portion through the nozzle, the plurality of expansion portions of the inflatable portion are inflated to fill the gaps and make the inflatable portion contract inwardly, so that the outer portion contracts inwardly and deforms, wherein when the gas is guided out of the inflatable portion, the inflatable portion is deflated and loosened to return to an uninflated state to loosen the shoe.

A pneumatic elastic band comprises an outer portion, an inflatable portion and a nozzle. The outer portion has a strip-shaped structure with elasticity. The inflatable portion comprises a plurality of expansion portions and a plurality of communication portions. Each of the communication portions is connected between two of the expansion portions adjacent to each other for defining a plurality of gaps. The nozzle is disposed on a surface of the outer portion and communicated with the inflatable portion. When a gas is guided into the inflatable portion through the nozzle, the plurality of expansion portions of the inflatable portion are inflated to fill the gaps and make the inflatable portion contract inwardly, so that the outer portion contracts inwardly and deforms, wherein when the gas is guided out of the inflatable portion, the inflatable portion is deflated and loosened to return to an uninflated state to loosen the shoe.

A breast pump according to the present invention includes a variable pressure generating unit, the variable pressure generating unit including a power driving unit including a stepping motor that is capable of rotating both normally and in reverse, and a negative pressure forming unit that creates a negative pressure state periodically by causing an elastic body to deform in accordance with a cycle period formed by the power driving unit, wherein the negative pressure forming unit is coupled to the expressing unit, and the stepping motor is capable of modifying an amplitude of the cycle period and the cycle period during negative pressure formation as desired. Hence, a suction pressure and a pressure increase/decrease cycle can both be set as desired, and moreover, a breast pump that uses electric power can be constructed compactly.

A breast pump according to the present invention includes a variable pressure generating unit, the variable pressure generating unit including a power driving unit including a stepping motor that is capable of rotating both normally and in reverse, and a negative pressure forming unit that creates a negative pressure state periodically by causing an elastic body to deform in accordance with a cycle period formed by the power driving unit, wherein the negative pressure forming unit is coupled to the expressing unit, and the stepping motor is capable of modifying an amplitude of the cycle period and the cycle period during negative pressure formation as desired. Hence, a suction pressure and a pressure increase/decrease cycle can both be set as desired, and moreover, a breast pump that uses electric power can be constructed compactly.

Disclosed is an electromagnetic vibratory pump, comprising a first C-shaped winding and a first magnet. The first C-shaped winding comprises a first coil and a first electromagnetizable member. The first coil covers the first electromagnetizable member, which comprises a first main body, a first leg and a second leg. The legs are connected to the first main body, and the distance between the legs is reduced from a first width to a second width from the first main body. The first magnet swings in a circular tangential direction. A point of tangency of the circular tangential direction is configured apart from the first leg and the second leg respectively by a first minimum distance. The first minimum distance is less than a half of the second width. The first magnet is driven by the first magnetic line of force to move in the first circular tangential direction, and the first magnet is driven by the second magnetic line of force to move in the second circular tangential direction.

Disclosed is an electromagnetic vibratory pump, comprising a first C-shaped winding and a first magnet. The first C-shaped winding comprises a first coil and a first electromagnetizable member. The first coil covers the first electromagnetizable member, which comprises a first main body, a first leg and a second leg. The legs are connected to the first main body, and the distance between the legs is reduced from a first width to a second width from the first main body. The first magnet swings in a circular tangential direction. A point of tangency of the circular tangential direction is configured apart from the first leg and the second leg respectively by a first minimum distance. The first minimum distance is less than a half of the second width. The first magnet is driven by the first magnetic line of force to move in the first circular tangential direction, and the first magnet is driven by the second magnetic line of force to move in the second circular tangential direction.

A magnetically driven pressure generator including a housing, flexible member, first magnetic force generator, and second magnetic force generator. The magnetically driven pressure generator oscillates the flexible member to increase or decrease the volume of a chamber, inversely increasing or decreasing the pressure of the chamber.

A magnetically driven pressure generator including a housing, flexible member, first magnetic force generator, and second magnetic force generator. The magnetically driven pressure generator oscillates the flexible member to increase or decrease the volume of a chamber, inversely increasing or decreasing the pressure of the chamber.