The present invention relates to a device for producing high-strength CO.sub.2 pellets from CO.sub.2 snow, in particular, for a cleaning device for blasting surfaces to be treated with a mixed-flow consisting of a compressed gas and CO.sub.2 pellets, including a main compressing device for compressing CO.sub.2 snow for forming CO.sub.2 pellets, further including a pre-compressing device for pre-compressing CO.sub.2 snow produced by expanding liquid CO.sub.2, wherein the pre-compressing device is in the form of a fluid-mechanical pre-compressing device, wherein the pre-compressing device includes an expansion device for producing CO.sub.2 snow from liquid or gaseous CO.sub.2 and a pre-compression chamber for receiving and pre-compressing the produced CO.sub.2 snow and wherein the expansion device and the pre-compression chamber are connected to one another in fluidic manner.

A powder chamber, in particular for powder polishing devices, including a casing and two functional sectors, whereby the two functional sectors are arranged to be opposite to each other, and whereby at least one functional sector is designed to provide an opening for a working medium such as air or a mixture of powder and air, and whereby the two functional sectors are designed to allow the powder chamber to be locked. The two functional sectors are preferably arranged along an axis and are rotationally symmetric.

A powder chamber, especially for or of a dental powder jet apparatus, including at least one conductive region, which is electrically conductive, where the at least one conductive region includes a contact surface, which is formed within the powder chamber.

Powder chamber for an air polishing device, extending from a top end to a bottom end along an axis, said powder chamber including at least two wall sections, where a first wall section forms a first angle with respect to the axis, and wherein a second wall section forms a second angle with respect to the axis, wherein the angles are measured in a measuring direction from the axis to the appropriate wall section in such a manner so that the acute angles are obtained, wherein the measuring direction) from the top end to the bottom end is counted positive, and wherein the measuring direction from the bottom end to the top end is counted negative, wherein the second wall section is arranged below the first wall section, and wherein the second angle is smaller than the first angle.

Dry ice container for dry ice cleaning devices comprises the container for dry ice closed by the lid (2) on the upper side, and provided by the opening (3) for drawing out dry ice pellets on the lower side. The container (1) has the bottom (4) sloped towards the opening (3) for drawing out the pellets. The linear-movable member (5) is arranged in the chamber (6) at the bottom (4) of the container (1) transversely to the axis of the container (1). The member (5) has the shape of a gutter in which groups of separated openings (5a, 5b, 5c) are provided, to which at least one pellets plowing element (5d) is placed in the member (5). Each group of openings (5a, 5b, 5c) pertains to one opening (3) for drawing out the pellets.

The invention relates to a device for dispensing dry ice snow, comprising a storage container (10) for receiving dry ice snow and vibrating means (102) and/or scraping means (103). An insert plate (105) with through-openings (106) is provided. The insert plate is located in the interior of the storage container (10), divides the storage container (10) into two regions, and can be set vibrating by means of the vibrating means (102) and/or scraped by means of the scraping means (103).

Device for mixing solid particles of dry ice and the flow of gaseous medium including a feeding element (2) rotatively placed within the fixed housing (1) having openings (12, 13) for the flow of gaseous medium and/or the flow of gaseous medium with solid particles. Between the fixed housing (1) and rotatively placed feeding element (2) the immovable elastic membrane (3) is placed. The fixed housing (1) is at the side of the elastic membrane (3) provided by at least one sealed pressure chamber (14) connected with the opening (13) for the flow of gaseous medium and/or the opening (12) for the flow of gaseous medium with solid particles.

A device (1) for adjusting and metering of dry ice granulate for a device for mixing solid particles of dry ice with a stream of a gaseous medium, comprising a body (2) having a granulate input section (5) and a granulate output section (6), between which is arranged a rotary element for transporting the granulate from the input section (5) to the output section (6), wherein at least two rotary feeding elements (3) are arranged parallel to each other in the body (2), wherein a shearing member (4) is arranged between said rotary feeding elements (3), wherein the feeding elements (3) are driven into rotation such that to rotate counter-rotationally relative to the direction of passage of the granulate from the granulate input section (5) to the granulate output section (6).

A dry ice blast cleaning system is disclosed. The system includes a dry ice feed apparatus, a mixing head, a supply of pressurized gas and a dispensing device. The apparatus has a hopper configured to store a supply of dry ice pieces with an anti-bridging device. A heat by-pass system is provided to heat the mixing head to prevent icing in the mixing head.

Powder chamber for an air polishing device, extending from a top end to a bottom end along an axis, said powder chamber including at least two wall sections, where a first wall section forms a first angle with respect to the axis, and where a second wall section forms a second angle with respect to the axis, where the angles are measured in a measuring direction from the axis to the appropriate wall section in such a manner so that the acute angles are obtained, where the measuring direction from the top end to the bottom end is counted positive, and where the measuring direction from the bottom end to the top end is counted negative, where the second wall section is arranged below the first wall section, and where the second angle is smaller than the first angle.