Heat exchanger cleaner

A solid fuel boiler, comprising:

• a heat exchanger having a plurality of vertically disposed tubes, each of said tubes having upper and lower ends;
• a fuel bed in said boiler, the lower ends of said tubes being nearer to said fuel bed than said upper ends of said tubes;
• a heat exchanger cleaner having an elongate means positioned within and lengthways of and in contact with each of said tubes, each of said elongate means having first and second ends;
• a support member mounted in the boiler above the upper ends of said tubes and movable relative to said tubes in an orbital path in a horizontal plane;
• a swivel device coupling the first end of each of said elongate members to said support member permitting relative rotation therebetween;
• and
• drive means, coupled to said support member, for moving said support member in the orbital path;
• whereby operation of the drive means causes said orbital movement of the support member and the elongate means within all of the tubes to be moved simultaneously over the respective inside surfaces of said tubes in a random manner by said swivel devices.

A solid fuel boiler, comprising:

• a heat exchanger of vertically disposed tubes for conveying hot air and combustion products, each of said tubes having an inside surface and upper and lower ends;
• a support member located above said upper ends of said tubes;
• a chain of interconnected links extending inside and lengthways of each of said tubes, each said chain having a first end attached to said support member and hanging downwardly from said support member;
• drive means, coupled to said support member, for moving said chains in horizontal orbital paths such that each said chain is in contact at all times with a part of said inside surface of the respective tube.