Nozzle head, cleaning system, method for cleaning and glass element

Abstract

At least one glass element includes: a first end; a second end; and a hollow portion including a first end section including the first end of the at least one glass element, a middle section, and a second end section including the second end of the at least one glass element. Each section has an inner surface and an outer surface and all sections are of equal length. A ratio of a number of particles on the inner surface at the first end section and/or the second end section to a number of particles on the inner surface at the middle section is 20 or less.

What is claimed is: 
     
         1 . At least one glass element, comprising:
 a first end;   a second end; and   a hollow portion comprising a first end section comprising the first end of the at least one glass element, a middle section, and a second end section comprising the second end of the at least one glass element, each section having an inner surface and an outer surface and all sections are of equal length, wherein a ratio of a number of particles on the inner surface at the first end section and/or the second end section to a number of particles on the inner surface at the middle section is 20 or less.   
     
     
         2 . The at least one glass element of  claim 1 , wherein the ratio of the number of particles on the inner surface at the first end section and/or the second end section to the number of particles on the inner surface at the middle section is 15 or less. 
     
     
         3 . The at least one glass element of  claim 2 , wherein the ratio of the number of particles on the inner surface at the first end section and/or the second end section to the number of particles on the inner surface at the middle section is 4 or less. 
     
     
         4 . The at least one glass element of  claim 2 , wherein the ratio of the number of particles on the inner surface at the first end section and/or the second end section to the number of particles on the inner surface at the middle section is 1.0 or more. 
     
     
         5 . The at least one glass element of  claim 1 , wherein the ratio of the number of particles on the inner surface at the first end section and/or the second end section to the number of particles on the inner surface at the middle section is 1.0 or more. 
     
     
         6 . The at least one glass element of  claim 1 , wherein the number of particles on the inner surface at the first end section and/or the second end section is 0 or more. 
     
     
         7 . The at least one glass element of  claim 6 , wherein the number of particles on the inner surface at the first end section and/or the second end section is 50 or more. 
     
     
         8 . The at least one glass element of  claim 6 , wherein the number of particles on the inner surface at the first end section and/or the second end section is 1000 or less. 
     
     
         9 . The at least one glass element of  claim 1 , wherein the number of particles on the inner surface at the first end section and/or the second end section is 1000 or less. 
     
     
         10 . The at least one glass element of  claim 1 , wherein each particle of the number of particles has a particle size of 50 μm or more. 
     
     
         11 . The at least one glass element of  claim 10 , wherein each particle of the number of particles has a particle size of 1000 μm or less. 
     
     
         12 . The at least one glass element of  claim 10 , wherein the particle size of each particle is a longest extension of the particle. 
     
     
         13 . The at least one glass element of  claim 1 , wherein each particle of the number of particles has a particle size of 1000 μm or less. 
     
     
         14 . The at least one glass element of  claim 1 , wherein the at least one glass element does not contain any particles on the inner surface at the first end section and/or the second end section having a particle size of 1000 μm or more. 
     
     
         15 . The at least one glass element of  claim 1 , wherein the particles are inorganic particles and/or are selected from the group consisting of glass, metal, dust, salt, and mixtures thereof. 
     
     
         16 . The at least one glass element of  claim 1 , wherein the at least one glass element comprises a plurality of glass elements to form a bundle of glass elements. 
     
     
         17 . The at least one glass element of  claim 16 , wherein the plurality of glass elements comprises between 2 and 500 glass elements. 
     
     
         18 . A cleaning system for cleaning the inside of a glass element with a fluid, the cleaning system comprising:
 a nozzle head comprising:
 a cleaning opening for releasing a part of the fluid and pointing in a first direction; and 
 a pressure balancing opening for releasing a part of the fluid and pointing in a second direction, wherein two half spaces comprising a first one and a second one are separated by a plane which is perpendicular to a center axis of the nozzle head, wherein a first direction vector of the first direction points in a direction at least one of towards the first half space or away from the second half space, wherein a second direction vector of the second direction points in a direction at least one of towards the second half space or away from the first half space. 
   
     
     
         19 . The cleaning system of  claim 18 , wherein the nozzle head comprises a feeding opening, the cleaning system further comprising a fluid supply line that is connected to the feeding opening of the nozzle head.