Title:
Thermostat
United States Patent 2396138


Abstract:
This invention relates to new and useful improvements in thermostatic devices. An object of the invention is to provide a novel thermostatic operating means having oppositely directed pressure-moved members. Another object is to provide such a means in which each of the members cooperates...



Inventors:
Sergius, Vernet
Application Number:
US48213943A
Publication Date:
03/05/1946
Filing Date:
04/07/1943
Assignee:
VERNAY PATENTS COMPANY
Primary Class:
Other Classes:
137/79, 236/34, 236/93A, 236/93R, 236/DIG.5
International Classes:
G05D23/13
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Description:

This invention relates to new and useful improvements in thermostatic devices.

An object of the invention is to provide a novel thermostatic operating means having oppositely directed pressure-moved members.

Another object is to provide such a means in which each of the members cooperates with temperature responsive material in separate chambers.

Another object is to provide such a means in which the members can have equal movement irrespective of differences or inequality in the forces opposing movements thereof.

Another object is to provide such a means in which the total extent of movement can be readily sub-divided to provide the desired extent of movement for each of the members.

The invention consists in the novel construction and arrangement of parts to be more fully described hereinafter and the novelty 'of which will be particularly pointed out and distinctly claimed.

In the accompanying drawing to be taken as a part of this specification there is fully and clearly illustrated a preferred embodiment of the invention, in which drawing the figure is a view in longitudinal central section through a valve embodying the invention.

Referring to the drawing by characters of reference, I designates generally a valve housing having a port 2. Aligned with the port there is an opening 3 closed by a cap member 4 which supports a valve and its operating mechanism.

Within the cap member 4 there is a bezel ring on which is supported an annular plate 6. Seated on the plate 6 there is an inverted cup-like member 7 having a lateral flange 8. A spring 9 within the member 4 holds the flange 8 against the plate 6. Mounted through an aperture in the base of member 7 there is a plunger or rod-like abutment member 10 having a flange or collar II seating against the member 7. The plunger reciprocally fits the bore of a tubular guide member 12 projecting downward from the top wall of the cap member 4.

The plunger 10 reciprocally fits the bore of a cylinder 13 which is supported on a helical coil spring 14 seated on the plate 6. The plunger 10 seats at its lower or inner end on a deformable sealing plug 15 of pliable elastic material, such as Ameripol or vulcanized gum rubber which is laterally distorted and compressed in the conical portion of a sealing bore 16. The cylinder 13 has an annular surrounding flange 17 which serves as a cover member for a cup-like casing 18 having a chamber 19 therein. The plug 15 seats on and is separated from the chamber 19 by a diaphragm 20. Filling the chamber 19 there is a temperature responsive pressure creating material 21 which may be a preformed pellet or body as in Patent No. 2,259,846 wherein the material is of crystalline nature, undergoing a change of state in its operating range. The casing 18 is separated from a similar casing 22 by a wall or partition member 23 which forms the common bottom wall for both casings. A heat exchange fin or flange 24 is preferably provided which extends outward from the wall 23.

The casing 23 has a chamber 25 which is filled with the temperature responsive pressure creating material 26, preferably the same as the material 21. The chamber 25 is closed and sealed by a diaphragm 27 clamped to the casing 23 by a cover member flange 28 on a cylinder 29. In the cylinder 29 there is a sealing bore 30 having a conical portion for laterally compressing and distorting a sealing plug 31 of the same material as the plug 15. The sealing bore 30 opens into a guide bore 32 in which there is reciprocally fitted a plunger or thrust rod 33. A helical coil spring 34 acts through a yoke 35 against the plunger 33 urging it against the plug 31.

At its other end the spring 34 seats against a flange 36 on the cylinder 29. The projecting end of the plunger 33 carries a valve member 37 cooperable with the valve port 2.

The operation is as follows: When the temperature responsive element is subjected to heat so that its temperature rises to say 150* F. which is the operating temperature, then the material 21, 26 will undergo its change of state thereby expanding rapidly with each further degree change in temperature. Since the pellets 21, 26 are of the same size, they will have the same volumetric change and as each can expand only in one direction, the plungers 10 and 33 will be moved outward. The force exerted by the pellets 21, 26 is far in excess of any resistance offered by the springs 14, 34 or by friction. Accordingly the plungers 10, and 33 will be moved outwardly equally or in proportion to the respective pellet expansions. As each pellet expands, it will force its diaphragm against the overlying flange 7I or 28 and thereby tend to hold the outer peripheral portion of the diaphragm in its clamped relation between the cup and the flange.

The diagrams will expand outward away from the partition wall 23 and into cup-like form in their respective sealing bores 16 and 30 as the expanding pellet material urges the sealing plugs II and 31 outward into the plunger guide bores.

Continued expansion of the pellets will seat the valve member 37 to close port 2. If for any reason, the pressure in port 2 against the valve member 37 should exceed the force of the spring I, then the complete valve unit supported by the spring 14, would move upward, compressing the spring 9 so that the valve member 37 would open.

By providing a'device as above described, the length of travel of the plungers 10 and 33 can be accurately determined thereby making possible the use of thinner diaphragms, and of plungers of shorter length. Also, different material can be employed for one of the pellets relative to the material in the other thereby to obtain a controlled movement of the plungers, both as to extent of travel and as to the temperature of response.

Having thus described the invention, what is claimed and desired to be secured by Letters Patent of the United States is: 1. A temperature responsive element comprising a body moveable rigid casing, a rigid common wall separating said casing into two oppositely facing chambers, temperature responsive pressure creating material in each of said chambers, oppositely directed pressure operated members closing and sealing said chambers, means acting between one of said members and said 03 'tasing and opposing movement of said one member by its responsive material, the other of said members being operable to move bodily said casing, and means opposing bodily movement of said casing by said other of said members. 2. A temperature responsive element comprising an open-ended casing, pressure responsive members closing and sealing the open ends of said casing, a temperature responsive pressure creating material in said casing and acting against said responsive members, and a wall rigid with said casing and positioned between said members, said wall dividing the material in accordance with the desired movement of said members upon temperature change. 3. A device of the character described, comprising a casing having its opposite ends open, a cover member closing each of said open ends, each cover meinber comprising an annular flange and a tubular guide member, said flanges surrounding and extending outward from said tubular members to meet the walls of said casing and being sealed at their outer peripheries to said casing, each flange providing an annular backing surface, inward of the casing walls, a diaphragm clamped between each flange and said casing, each diaphragm being backed above its chamber by its cover member flange, temperature responsive material filling said casing and urging said diaphragms against their backing flanges, a resilient sealing plug in each guide bore, means holding said plugs against said diaphragms, and a partition dividing said casing internally so that said diaphragms will be expanded equally by said material.

4. A device of the character described, comprising a supporting member, a bodily movable casing having an open side, a cover member closing said open side and having a tubular guide member, the bore of said guide member opening into said casing, a helical coil spring surrounding said guide member and held under compression between said guide member and said supporting member such that said supporting member supports said casing, said bore having a conical sealing portion diverging toward said casing, a pliable elastic resilient sealing plug in said bore aid laterally distorted by said sealing portion, a-diaphragm clamped between said casing and Said cover member and seating against said plug, a plunger in said guide bore and seating on said plug, temperature responsive material filling said casing, and an abutment engaged by said plunger so that expansion of said material will move bodily said casing against the force of said spring.

5. A temperature responsive element comprising a bodily movable rigid casing, a rigid common wall separating said casing internally into two oppositely facing chambers, temperature responsive pressure creating material in each of said chambers, said wall serving as a heat exchange member common to the material in both chambers, said chambers each having an opening opposite said common wall, pressure operated members sealing said openings and said material in said chambers, a control member movable by one of said pressure operated members upon expansion of its chamber material, means abutted by the other of said pressure operated members so that expansion of its chamber material will move bodily said casing and said control member, and means opposing operation of said control member by said temperature responsive material.

SERGIUS VERNET.