GB1600611A - Boiler - Google Patents

Description

(54) A BOILER (71) I, PETER HENRIK TEISEN, a British Subject of 15 Hazel Bank, Kings Norton, Birmingham B38 8BT, do hereby declare the invention for which I pray that a Patent may be granted to me and the method by which it is to be performed to be particularly described in and by the following statement: This invention relates to a boiler and particularly to a central heating boiler of the kind intended to heat domestic water and central heating systems by burning refuse.

According to one aspect of the invention, a boiler comprises an inner shell defining a combustion chamber and surrounded by an outer shell, the two shells defining between them a generally annular space having an inlet and an outlet for passage of heat exchange medium through the space, and baffles arranged longitudinally of the boiler within the space to constrain said medium flowing between said inlet and outlet to make at least one reversal of flow and thereby increase the length of flow path between the inlet and outlet.

Conveniently, the baffles extend respectively alternatively from opposite ends of the boiler.

In one preferred arrangement, the combustion chamber is provided with a door having at least one air inlet therethrough, the passage of air through the inlet being controlled by a closure member, the boiler further comprising means mounted on a fixed part of the boiler and responsive to an operating temperature of the boiler, and a linkage coupling the temperatureresponsive means to the closure member in a manner enabling the position of the member to be adjusted automatically by the temperature-responsive means in response to said temperature so as to vary the flow of air through the inlet, the linkage including one or more flexible elements arranged so that said door may be swung open to permit access to the boiler without disconnecting the linkage or varying the position of the member.

In one convenient arrangement, the door has a pair of inlets and associated closure members, said linkage coupling the closure members for simultaneous automatic adjustment by said temperature-responsive means.

The invention will now be described, by way of example, with reference to the accompanying drawings in which: Figure 1 is a front end view of one form of the boiler of the invention; Figure 2 is a rear end view of the boiler of Figure 1; Figure 3 is a side view of the boiler of Figures 1 and 2, and Referring to the drawings, these show a central heating boiler comprising an inner shell 1 and an outer shell 2 surrounding the inner shell, the shells being secured together, as by welding, to form between them a space 3 for passage of water between an inlet 4 and an outlet 5. The inner shell defines a combustion chamber 1A and water in the space 3 is in contact with the outer cylindrical wall and rear end wall of the shell 1. A flue 1B evacuates combustion products from the chamber 1A and is controlled by a damper 1C operated by a lever 1D.A grate 1E is provided in the chamber 1A but may be dispensed with if desired. A fixed smoke baffle 1F is provided towards the top of the combustion chamber.

The outer shell is surrendered by insulating material 6 held in position by a casing 7 surrounding both shells 1 and 2. The boiler is supported on four legs, two of which 8, 9 are secured to the rear of the boiler, the other two 10, 11 being secured at the front end of the boiler by mounting webs 12.

Between the shells 1 and 2 is arranged a series of baffles for constraining the water to follow a desired path between the inlet and outlet. Two of the baffles 13 and 14 are arranged towards the top of the boiler and extend axially from the front end thereof, terminating slightly over halfway therealong. The baffles 15 and 16 are disposed lower than 13 and 14 and extend axially from the rear end. Being lower, they are also closer together and are joined at their rear end portions by a transverse plate 17 which prevents water. as it enters the inlet 4, from passing upwardly into the end portion of the space 3. A further pair of baffles 51 and 52 extends forwardly from the outlet 5 along the top of the inner shell 1 to a location adjacent the front end of the boiler.

It will be seen that water entering the inlet 4 is prevented by the plate 17 from rising into the end portion of the space 3 and is constrained by the baffles 15 and 16 to travel axially of the boiler to the end of these baffles before flowing upwardly in the space 3. Baffles 13 and 14 then produce a reversal of water flow until the water reaches the free ends of these baffles, whereupon it continues to rise and reach the top of the boiler. It cannot, however, reach the outlet 5 without flowing between the baffles 51 and 52 which it enters towards the end of the boiler remote from the outlet so that a further reversal in flow takes place.

The arrangement of baffles thus enables the water flowing through the space 3 to travel along an extended path in contact with the heated inner shell 1, to promote efficient use of the heat generated. Water rising in the end portion of the space 3 is substantially prevented from reaching the outlet 5 by a further baffle 53, although a small gap is left above this baffle to permit a small leakage rate and exit of air.

A thermostat 20 is secured to the upper part of the boiler and has a probe 21 which extends into the space 3 to sense the water temperature. An extension 22 of the thermostat, which can move in either vertical direction according to the sensed temperature, is connected by a chain 23 to a rod 24 pivoted on the boiler door 24a. A pair of closure members 25, 26 for associated air inlets are pivotally mounted at 27, 28 respectively for vertical movement and each is provided with a rigid laterally extending bar 29, 30. The bars 29, 30 are connected together by a further chain 31 which is also connected to the rod 24.

When the temperature of the water is low the members 25, 26 are in open positions, permitting a large inflow of air and thus rapid combustion to raise the temperature.

As the temperature rises, the thermostat operates to lower the extension 22 progressively, this in turn permitting the members to move towards closed positions. It will be seen that the linkage between the thermostat and members permits the door 24a to swing about its hinges 33, either to a position in which it extends axially of the boiler (position M) or to a position in which it extends transversely of the boiler (position L). as seen more clearly in Figure 1. Such swinging movement of the door can be performed without varying the positions of the members 35, 26, or dismantling the linkage between the thermostat and members.

WHAT WE CLAIM IS: 1. A boiler comprising an inner shell defining a combustion chamber and surrounded by an outer shell, the two shells defining between them a generally annular space having an inlet and an outlet for passage of heat exchange medium through the space, and baffles arranged longitudinally of the boiler within the space to constrain said medium flowing between said inlet and outlet to make at least one reversal of flow and thereby increase the length of flow path between the inlet and outlet.

2. A boiler according to Claim 1 wherein the baffles extend respectively alternately from opposite ends of the boiler.

3. A boiler according to Claim 1 or Claim 2 wherein pairs of said baffles extend from each end of the boiler, the baffles of each pair being spaced peripherally of the shells.

4. A boiler according to Claim 3, wherein a pair of baffles towards the top of the boiler have a greater peripheral spacing than a pair of baffles towards the bottom of the boiler.

5. A boiler according to any one of the preceding claims wherein the outlet is disposed at or near one end of the boiler and a pair of baffles extend from the outlet towards the other end of the boiler.

6. A boiler according to any one of the preceding claims wherein the inlet and outlet are disposed at or near the same end of the boiler the outlet being above the inlet.

7. A boiler according to any one of the preceding claims wherein the combustion chamber is provided with a door having at least one air inlet therethrough, the passage of air through the inlet being controlled by a closure member, the boiler further comprising means mounted on a fixed part of the boiler and responsive to an operating temperature of the boiler, and a linkage coupling the temperature-responsive means to the closure member in a manner enabling the position of the member to be adjusted automatically by the temperatureresponsive means in response to said temperature so as to vary the flow of air through the inlet, the linkage including one or more flexible elements arranged so that said door may be swung open to permit access to the boiler without disconnecting the linkage or varying the position of the member.

8. A boiler according to Claim 7, wherein the door has a pair of inlets and associated closure members said linkage coupling the closure members for simul

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. which prevents water. as it enters the inlet 4, from passing upwardly into the end portion of the space 3. A further pair of baffles 51 and 52 extends forwardly from the outlet 5 along the top of the inner shell 1 to a location adjacent the front end of the boiler. It will be seen that water entering the inlet 4 is prevented by the plate 17 from rising into the end portion of the space 3 and is constrained by the baffles 15 and 16 to travel axially of the boiler to the end of these baffles before flowing upwardly in the space 3. Baffles 13 and 14 then produce a reversal of water flow until the water reaches the free ends of these baffles, whereupon it continues to rise and reach the top of the boiler. It cannot, however, reach the outlet 5 without flowing between the baffles 51 and 52 which it enters towards the end of the boiler remote from the outlet so that a further reversal in flow takes place. The arrangement of baffles thus enables the water flowing through the space 3 to travel along an extended path in contact with the heated inner shell 1, to promote efficient use of the heat generated. Water rising in the end portion of the space 3 is substantially prevented from reaching the outlet 5 by a further baffle 53, although a small gap is left above this baffle to permit a small leakage rate and exit of air. A thermostat 20 is secured to the upper part of the boiler and has a probe 21 which extends into the space 3 to sense the water temperature. An extension 22 of the thermostat, which can move in either vertical direction according to the sensed temperature, is connected by a chain 23 to a rod 24 pivoted on the boiler door 24a. A pair of closure members 25, 26 for associated air inlets are pivotally mounted at 27, 28 respectively for vertical movement and each is provided with a rigid laterally extending bar 29, 30. The bars 29, 30 are connected together by a further chain 31 which is also connected to the rod 24. When the temperature of the water is low the members 25, 26 are in open positions, permitting a large inflow of air and thus rapid combustion to raise the temperature. As the temperature rises, the thermostat operates to lower the extension 22 progressively, this in turn permitting the members to move towards closed positions. It will be seen that the linkage between the thermostat and members permits the door 24a to swing about its hinges 33, either to a position in which it extends axially of the boiler (position M) or to a position in which it extends transversely of the boiler (position L). as seen more clearly in Figure 1. Such swinging movement of the door can be performed without varying the positions of the members 35, 26, or dismantling the linkage between the thermostat and members. WHAT WE CLAIM IS:

1. A boiler comprising an inner shell defining a combustion chamber and surrounded by an outer shell, the two shells defining between them a generally annular space having an inlet and an outlet for passage of heat exchange medium through the space, and baffles arranged longitudinally of the boiler within the space to constrain said medium flowing between said inlet and outlet to make at least one reversal of flow and thereby increase the length of flow path between the inlet and outlet.

2. A boiler according to Claim 1 wherein the baffles extend respectively alternately from opposite ends of the boiler.

3. A boiler according to Claim 1 or Claim 2 wherein pairs of said baffles extend from each end of the boiler, the baffles of each pair being spaced peripherally of the shells.

4. A boiler according to Claim 3, wherein a pair of baffles towards the top of the boiler have a greater peripheral spacing than a pair of baffles towards the bottom of the boiler.

5. A boiler according to any one of the preceding claims wherein the outlet is disposed at or near one end of the boiler and a pair of baffles extend from the outlet towards the other end of the boiler.

6. A boiler according to any one of the preceding claims wherein the inlet and outlet are disposed at or near the same end of the boiler the outlet being above the inlet.

7. A boiler according to any one of the preceding claims wherein the combustion chamber is provided with a door having at least one air inlet therethrough, the passage of air through the inlet being controlled by a closure member, the boiler further comprising means mounted on a fixed part of the boiler and responsive to an operating temperature of the boiler, and a linkage coupling the temperature-responsive means to the closure member in a manner enabling the position of the member to be adjusted automatically by the temperatureresponsive means in response to said temperature so as to vary the flow of air through the inlet, the linkage including one or more flexible elements arranged so that said door may be swung open to permit access to the boiler without disconnecting the linkage or varying the position of the member.

8. A boiler according to Claim 7, wherein the door has a pair of inlets and associated closure members said linkage coupling the closure members for simul

taneous automatic adjustment by said temperature responsive means.

9. A boiler substantially as hereinbefore described with reference to the accompanying drawings.