Importance

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Abstract

An ejection device for ejecting a liquid or a liquid containing solid particles at high pressure, comprising a head unit; a pressure chamber (11) which opens into a distal ejection opening and is delimited by a working piston which, upon application of an elastic impact on its end facing away from the pressure chamber, is capable of transmitting a compression wave which may displace the pressure chamber-facing end of the working piston into the pressure chamber so that the volume thereof is reduced, with the reduction in volume of the pressure chamber being significantly smaller than the original volume of the pressure chamber; and a drive unit having a drive member which is accelerated across an acceleration portion formed within the drive unit so that it generates the elastic impact to be transmitted to the working piston. The pressure chamber is at least partially formed by a pressure cavity formed in the head unit. The need unit and the drive unit are formed as separate, independent units which are mounted to each other by a separable mounting coupling. An intermediary member is provided between the working piston and the acceleration portion as a separate component to transmit the elastic impact from the drive member to the working piston, said intermediary member being arranged in the drive unit of the device. Further, the acceleration portion of the drive unit is tightly sealed by the intermediary member.

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First Claim