An electrical inflator has a cylindrical shell, an electrical aeration pump, an illumination assembly, a cell base and a switch assembly. The cylindrical shell has a tube, a front cover and a rear cover. The electrical aeration pump is mounted in the tube near the front cover and has a gas outlet located in the tube. The illumination assembly is mounted in the tube towards the front cover. The cell base is mounted in the tube behind the electrical aeration pump. The cell base has at least one cell. The switch assembly is mounted in the tube and electrically connects to the cell base, the electrical aeration pump and the illumination assembly.

An electrical inflator has a cylindrical shell, an electrical aeration pump, an illumination assembly, a cell base and a switch assembly. The cylindrical shell has a tube, a front cover and a rear cover. The electrical aeration pump is mounted in the tube near the front cover and has a gas outlet located in the tube. The illumination assembly is mounted in the tube towards the front cover. The cell base is mounted in the tube behind the electrical aeration pump. The cell base has at least one cell. The switch assembly is mounted in the tube and electrically connects to the cell base, the electrical aeration pump and the illumination assembly.

Autonomous fluid compressor for supplying compressed fluid to a cable laying device, the fluid compressor comprising a fluid compressing unit arranged to compress fluid and comprising an exhaust valve, an electric motor, for driving the fluid compressing unit, a rechargeable power unit, to supply electric power to the electric motor, a fluid supply port connected to the exhaust valve, characterized in that the fluid compressor including an input unit, for receiving a fluid demand signal indicating a fluid demand from the cable laying device, and a control unit, arranged to control the motor based on the fluid demand signal.

Autonomous fluid compressor for supplying compressed fluid to a cable laying device, the fluid compressor comprising a fluid compressing unit arranged to compress fluid and comprising an exhaust valve, an electric motor, for driving the fluid compressing unit, a rechargeable power unit, to supply electric power to the electric motor, a fluid supply port connected to the exhaust valve, characterized in that the fluid compressor including an input unit, for receiving a fluid demand signal indicating a fluid demand from the cable laying device, and a control unit, arranged to control the motor based on the fluid demand signal.

The present disclosure discloses a silent air pump box comprising a box body, an upper cover, a supporting platform, an air pump, an air valve, an air pipe and a silencing pipe. The present disclosure further provides an intelligent adjustment mattress, which comprises the silent air pump box and an airbag layer, wherein the silent air pump box is provided at the tail of the mattress.

A reciprocating cryogenic pump 2 comprises a piston reciprocable within a pumping chamber 44. The pumping chamber 44 has an inlet suction valve 48 for cryogenic liquid to be pumped and an outlet 32 for high pressure cryogenic liquid. The inlet valve 48 for the cryogenic liquid communicates with a cryogenic liquid reception chamber 46 in the cold end or head 6 of the pump 2. The pump head 6 is at least partially surrounded by a first jacket 8 retaining primary vacuum insulation. The first jacket 8 is itself at least partly surrounded by a second jacket 10. The jacket 10 defines a chamber for the reception of a coolant fluid such as liquid nitrogen and the second jacket has an inlet 20 and an outlet 22 for the liquid nitrogen. The thermal insulation can be further enhanced by a trapped gas space 73 between the first jacket 8 and an inner sleeve 52, the latter defining with an outer sleeve 50 vacuum insulation for the pumping chamber 44.

A reciprocating cryogenic pump 2 comprises a piston reciprocable within a pumping chamber 44. The pumping chamber 44 has an inlet suction valve 48 for cryogenic liquid to be pumped and an outlet 32 for high pressure cryogenic liquid. The inlet valve 48 for the cryogenic liquid communicates with a cryogenic liquid reception chamber 46 in the cold end or head 6 of the pump 2. The pump head 6 is at least partially surrounded by a first jacket 8 retaining primary vacuum insulation. The first jacket 8 is itself at least partly surrounded by a second jacket 10. The jacket 10 defines a chamber for the reception of a coolant fluid such as liquid nitrogen and the second jacket has an inlet 20 and an outlet 22 for the liquid nitrogen. The thermal insulation can be further enhanced by a trapped gas space 73 between the first jacket 8 and an inner sleeve 52, the latter defining with an outer sleeve 50 vacuum insulation for the pumping chamber 44.

The invention relates to a multi-chamber with ultra-high-pressure or hydraulic motor compressors or motor pumps for compressing gas or liquid at ultra-high pressure, formed by several different-sized concentric chambers, wherein each chamber contains smaller chambers, there being installed between the chambers motors or pumps that enable fluid to be introduced into the inner chambers at increasingly greater pressure.

The invention relates to a control device for controlling a pneumatic component, the device including a compressed air supply circuit for connecting to an inlet of the pneumatic component. The circuit comprises both a normally closed monostable valve having an inlet for connecting to a compressed air source and an outlet for connecting to the pneumatic component, and also a bistable directional valve having both a first port for connecting to the compressed air source and also a second port connected to a first port of a normally passing monostable directional valve, the monostable directional valve having a second port connected to a pneumatic control port of the monostable valve; the bistable directional valve is capable of adopting a passing state in which a connection is created between the first port and the second port of said directional valve, and a non-passing state in which the first port and the second port are disconnected from each other; and the monostable directional valve is capable of adopting a rest state in which a connection is created between the first port and the second port of said directional valve, and an exhaust state in which the second port of said directional valve is connected to an exhaust outlet.

The disclosure relates to a three-stage reciprocating compressor comprising pistons and suction and compression chambers in which a medium is compressed for each separate stage, which stages are connected in series and where a first stage is fluidly connected to an inlet for inlet of uncompressed or pre-compressed gas where the three-stage pistons move synchronously along a common axis in one connected unit such that the first and second stage suction and compression chambers share piston as well as cylinder wall, and having separate cylinder heads, a top headpiece and a bottom headpiece on each side of the piston, the third stage piston extending from a center of the first and second stage common piston and is passed through an opening in the cylinder head of the first stage suction and compression chamber, in extension of which is placed a third stage cylinder tube with a smaller diameter than a diameter of the cylinder for stage one and two, each stage fluidly separated by one or more one way valves, where the second stage suction and compression chamber is formed between the cylinder wall and a piston skirt as well as between an underside of the piston and the headpiece placed in a bottom of the cylinder.