Submerged and fusible device with safety valves that replace the

Details Submerged and fusible device with safety valves that replace the Submerged and fusible device with safety valves that replace the

1991-07-03

1992-12-29

Tapolcai, William E.

Automatic temperature and humidity regulation

Cooling radiator

Bypass

236DIG2, F01P 716

Patent

active

051744961

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a safety device having a poppet and an immersed temperature-sensing element, this device being more particularly intended for the cooling system of an internal combustion engine.
This device controls the circulation of the cooling fluid in a pipe connecting the engine and a radiator, and comprises for this purpose a poppet associated with a temperature-sensing element immersed in the said fluid, suitable for controlling the increase in the opening of the poppet when the temperature of the cooling fluid increases and for allowing the reduction in this opening of the poppet when the temperature of the cooling fluid decreases, the said poppet being urged against its valve seat by a first spring which acts in opposition to the movable portion of the said temperature-sensing element when the latter actuates the said increase in the opening of the poppet, a device in which the said poppet is solidly attached to the said temperature-sensing element by at least one solder element provided in order to melt at a so-called "safety" temperature at which the circulation of the cooling fluid between the engine and the radiator has to be allowed at full opening.
A device of this type is known, for example by the U.S. Pat. No. KELLY 3,558,046, which comprises a temperature-sensing element 24 suitable for controlling the opening of a poppet 22 returned back to its closed position by a spring 35 acting on a brace 37. A fusible metal rivet 41 connects the top of this brace to the poppet 22 and to the upper end 26 of the temperature-sensing element. When the temperature of the cooling fluid increases, the upper portion 26 of the temperature-sensing element moves upwards forcing with it the poppet 22, which increases the flow rate of the cooling fluid. When the temperature of the cooling fluid reaches the critical value, the metal rivet 41 melts and the poppet 22 is no longer held in place by the brace 37; this poppet escapes into the circulation system of the cooling system.
This device has three essential drawbacks.
One reason for this is that, the more the temperature of the cooling fluid increases the more the spring 35 is compressed and the more the top of the brace 37 subjects the fusible metal rivet 41 to high mechanical stresses, which runs the risk of destroying the latter before the temperature of the cooling fluid reaches the critical value.
The second drawback resides in the fact that the metal rivet 41 passes from the solid state to the molten state by passing through a pasty intermediate state, which increases the above-mentioned risk of destruction of the fusible metal rivet 41 well before it reaches the critical temperature.
The third drawback resides in the fact that after rupture of the metal rivet, the poppet, escaping into the cooling system, runs the risk of creating a blockage of the downstream cooling pipe or of creating other problems therein.
The object of the present invention is to eliminate all these drawbacks.
For this purpose, a safety device having a poppet, of the general type defined hereinablve is, in accordance with the present invention, essentially characterised in that it comprises a second spring acting on the said poppet in its opening direction, by opposing the said first spring, in that this first spring can only act on the said poppet by the agency of the said temperature-sensing element, namely only when the said solder element ensures the solid attachment between the temperature-sensing element and the poppet, and in that the said solder element is formed from a eutectic material, namely a material passing directly from the solid state to the liquid state when it is subjected to a specified temperature without passing through the pasty intermediate state.
By virtue of this general arrangement, the second spring relaxes when the temperature of the cooling fluid increases, since this increase in the temperature tends to open the poppet. As a result the fusible solder element undergoes, at the level of its connection with the temperature-sensing element

REFERENCES:
patent: 3189276 (1965-06-01), Bailey
patent: 3300134 (1967-01-01), Wahler
patent: 3498537 (1970-03-01), Wong
patent: 3558046 (1971-01-01), Kelly
patent: 4245782 (1981-01-01), Brown
patent: 4453668 (1984-06-01), Abel
patent: 4981260 (1991-01-01), Beiser
patent: 5011074 (1991-04-01), Kline

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