An instrument air system and method is disclosed herein. The instrument air system includes a shaft-driven air compressor configured to generate instrument air by compressing atmospheric air, a power take off configured to derive drive torque from a driven rotary shaft of the process, wherein the power take off may include a concentrically-mounted clamping collar adapted to frictionally engage the driven rotary shaft, a torque-transfer assembly configured to transfer the drive torque derived by the power take off to the shaft-driven air compressor, wherein the torque-transfer assembly comprises a set of interoperating gears including a ring gear operably coupled to the clamping collar, and an instrument-air pathway configured to supply the instrument air generated by the shaft-driven air compressor to the pneumatic process-control subsystem. The instrument air system and method is useful for reducing hydrocarbon emissions of a process using a pneumatic process-control subsystem.

A pump assembly and a cooking appliance having a pump assembly are provided. The pump assembly may include a cavity that defines a cooking cavity; a water supplier installed outside of the cavity; a connection pipe connected to the water supplier; and a pump assembly disposed outside of the cavity and connected to the connection pipe. The pump assembly may includes at least one pump; and a support made of a flexible material and coupling the at least one pump to an upper surface of the cavity.

A near isothermal machine for compressing or expanding gas having a piston in a main cylinder with a heat absorbing and releasing structure attached thereto. The main cylinder contains a substantially constant volume of liquid maintained at a substantially constant temperature and a variable volume of gas, the gas temperature being controlled to substantially the same temperature as the liquid by the movement with the piston of the heat absorbing and releasing structure. A compensator is provided to compensate for variations in the level of liquid as the piston moves in the main cylinder.

A method for the weight-dependent control of the internal pressure of a supporting body loaded by a weight load or payload, wherein the internal pressure is produced by means of an electric-motor-driven compressor, and the weight load or payload which is present and which acts on a supporting body in the form of a mass m.sub.Load under the effect of acceleration due to gravity g is determined in that a reduction and a subsequent increase in the internal pressure take place, wherein the increase in the internal pressure causes the position of an application point of the weight load or payload to change by a position difference Z, wherein: during the increasing of the internal pressure by means of the compressor, the motor current I.sub.Load of the drive motor of the compressor is measured with a constant motor voltage U and integrated over the time of the increase in pressure, and the electrical work W.sub.Load which is necessary for the change in position is determined therefrom, wherein the electrical work W.sub.Load the electrical work W.sub.Load is compared with a characteristic value of the electrical work W.sub.0 from a characteristic diagram, wherein the change in position Z, the difference in mass m and the difference in payload F.sub.Z are determined from the difference W between W.sub.Load and W.sub.0 and the mass m.sub.Load and the weight load or payload which is actually present as a result is determined therefrom.

A method for the weight-dependent control of the internal pressure of a supporting body loaded by a weight load or payload, wherein the internal pressure is produced by means of an electric-motor-driven compressor, and the weight load or payload which is present and which acts on a supporting body in the form of a mass m.sub.Load under the effect of acceleration due to gravity g is determined in that a reduction and a subsequent increase in the internal pressure take place, wherein the increase in the internal pressure causes the position of an application point of the weight load or payload to change by a position difference Z, wherein: during the increasing of the internal pressure by means of the compressor, the motor current I.sub.Load of the drive motor of the compressor is measured with a constant motor voltage U and integrated over the time of the increase in pressure, and the electrical work W.sub.Load which is necessary for the change in position is determined therefrom, wherein the electrical work W.sub.Load the electrical work W.sub.Load is compared with a characteristic value of the electrical work W.sub.0 from a characteristic diagram, wherein the change in position Z, the difference in mass m and the difference in payload F.sub.Z are determined from the difference W between W.sub.Load and W.sub.0 and the mass m.sub.Load and the weight load or payload which is actually present as a result is determined therefrom.

The present invention relates to a vehicle wheel comprising a hub, a rim and an inflatable tyre, in which the hub is situated around a rotation axle of the wheel, a compressor which is situated substantially inside the hub for compressing outside air, provided with an inlet for taking in air at atmospheric pressure and an outlet for delivering air at an increased pressure; a drive for driving the compressor, in which the drive is movable with respect to the rotation axle, in particular rotatable, more particularly rotatable in a direction opposite to that of the hub; an air reservoir for storing the air at increased pressure, in which the air reservoir is situated inside the rim of the wheel; a connection for connecting the outlet of the compressor to the air reservoir of the inflatable tyre of the wheel.

The present invention relates to a vehicle wheel comprising a hub, a rim and an inflatable tyre, in which the hub is situated around a rotation axle of the wheel, a compressor which is situated substantially inside the hub for compressing outside air, provided with an inlet for taking in air at atmospheric pressure and an outlet for delivering air at an increased pressure; a drive for driving the compressor, in which the drive is movable with respect to the rotation axle, in particular rotatable, more particularly rotatable in a direction opposite to that of the hub; an air reservoir for storing the air at increased pressure, in which the air reservoir is situated inside the rim of the wheel; a connection for connecting the outlet of the compressor to the air reservoir of the inflatable tyre of the wheel.

A linear compressor includes a cylinder, a piston configured to axially reciprocate in the cylinder, a first muffler unit coupled to the piston, a back cover that is disposed at a rear of the piston and defines an opening in a radially central area thereof, and a second muffler unit coupled to the opening. The first muffler unit includes an inner guide disposed in the piston and a first intake muffler disposed at a rear of the inner guide. The second muffler unit includes a second intake muffler that is in fluid communication with the first intake muffler and coupled to the opening, and a muffler body surrounding the second intake muffler. The second muffler unit further includes a rib protruding from an outer surface or an inner surface of the second intake muffler.

A linear compressor includes a cylinder, a piston configured to axially reciprocate in the cylinder, a first muffler unit coupled to the piston, a back cover that is disposed at a rear of the piston and defines an opening in a radially central area thereof, and a second muffler unit coupled to the opening. The first muffler unit includes an inner guide disposed in the piston and a first intake muffler disposed at a rear of the inner guide. The second muffler unit includes a second intake muffler that is in fluid communication with the first intake muffler and coupled to the opening, and a muffler body surrounding the second intake muffler. The second muffler unit further includes a rib protruding from an outer surface or an inner surface of the second intake muffler.

A three-stage variable color paste pump, comprising: a differential pump, which includes: a rodless cavity, a rod containing cavity, and a piston rod; configuring a control valve, which comprises a valve body and a valve core, wherein the valve body is provided with a rod containing cavity opening which is in communication with the rod containing cavity; configuring a rodless cavity opening as in communication with the rodless cavity, configuring a color paste tank opening as in communication with a color paste tank, and configuring an injection outlet; configuring a channel on the valve core, moving the valve core to different positions may form three communication structures. The pump uses one differential pump to achieve three-stage injection output, thus ensuring the accuracy of the injection output of the color paste pump. The pump has a simple structure, takes up a small surface area, and is easy to use.