FR2474129A1 - THERMOSENSIBLE CONTROL VALVE - Google Patents

Abstract

THIS VALVE INCLUDES A THERMOSENSITIVE BULB 17 MOUNTED SO AS TO MOVE AXIALLY IN A CONTAINER 10 HAVING A FIXED SEAT 14. A MOBILE SHUTTER 27 IS IN SLIDING CONTACT WITH THE SEAT. SURFACES 33, 24 COOPERATING THE ASSEMBLY OF THE SHUTTER 27 AND OF THE HOUSING 18 OF THE BULB 17 SERVING TO PREVENT THE FLOW BETWEEN THESE SURFACES WHEN THE TEMPERATURE OF THE BULB IS LOWER THAN A FIRST PREDETERMINED VALUE. WHEN THE BULB TEMPERATURE RISES ABOVE THIS VALUE, A LEAK PATH IS OPENED BETWEEN THESE SURFACES, AND WHEN THE BULB TEMPERATURE REACHES A SECOND PREDETERMINED HIGHER VALUE, THE MOVING SHUTTER 27 IS FIXED BY 14 S THROUGH BOX 18 TO ALLOW A GREATER FLOW. APPLICATION TO THE WATER COOLING CONTROL OF INTERNAL COMBUSTION ENGINES.

Description

The present invention relates to a compression valve

  temperature sensitive, more particularly, although not

  exclusively for use in order to control the

  flow and thus the temperature of the cooling water of a water-cooled internal combustion engine or the like. A conventional valve of this type usually includes

  an auxiliary valve having a small opening which opens when

  that the temperature of a bulb sensitive to temperature

  raises to a first predetermined value. The conventional valve also includes a main valve having a large orifice which opens when the water temperature of

  cooling continues to rise up to a second

  their predetermined upper. In such a construction, it is possible to prevent pumping of the valve which can occur due to pressure fluctuations upstream and downstream of the valve, produced by the secondary opening of the valve when the thermosensitive bulb is operated for

  open the valve when it has captured a certain level of teix-

  cooling water temperature. It is also possible

  to prevent an increase in the actual temperature of

opening of the valve.

  However, in a conventional valve as above, the main valve and the auxiliary valve are formed in separate bodies, and the result is a complication of the

  valve construction and inaccuracy in the

flow rate.

  The object of the invention is to eliminate the disadvantages

  mentioned above, and to produce a thermosensitive valve in which

  the main valve itself also fulfills the function

  shutter or seat for the auxiliary valve, while

  that the thermosensitive bulb housing also fulfills

  even the shutter or seat function for the auxiliary valve

  thereby ensuring a simplified construction capable of

  to control the flow of the flow with a precision

sion bigger.

  The object of the invention is, for this purpose, a

  heat-sensitive strip comprising a frame having a fixed seat, a thermosensitive bulb having a mobile housing axially disposed inside the frame, a movable shutter surrounding

  a part of said thermosensitive bulb and in sliding contact

  axially with the fixed seat, a surface provided on the ob-

  turner being adapted to come into contact with a surface

  said housing to close a leakage path, elastic means

  ticks acting on the shoemaker to maintain said surface

  these in contact and prevent a flow between them, and a

  contact member fixed on a part of said housing, this wood

  a moving body in the appropriate direction for opening a leakage path between said surfaces when the temperature of said thermosensitive bulb reaches a first predetermined value,

  the shutter remaining closed against the fixed seat during the

  placing said housing to open the escape route, and

  said contact member being adapted to discard said ob-

  of said fixed seat when the temperature of the thermal bulb

  mosensitive reaches a second predetermined higher value.

  Other features and advantages of the invention

  will appear in the following description, made

  with reference to the accompanying drawing given solely as e-

  and wherein - FIG. 1 is an axial sectional view of a thermosensitive control valve according to the invention; FIG. 2 is a top plan view of the valve

represented in FIG. 1.

  Referring to the drawing, the valve comprises a frame

  as a whole by reference 10 and comprising a

  flat annular element 11, a retaining member 12 and a stirrup

  13, which are all set together against any displacements

  relative. A fixed cylindrical seat 14 having an axially extending surface is fixed on the inner periphery of the annular member 11. A support rod 16 is attached to the stirrup 13 and slidably protrudes within a housing. thermosensitive bulb 17. The bulb 17 comprises a housing 18 having a cylindrical portion 19 which is axially slidably disposed in a central opening 21 provided in the lower end of the retaining member 12. The housing 18 comprises a enlarged part 22 above the part

  cylindrical 19, and this enlarged portion 22 comprises at its

  The boXtier 18 contains a crystalline wax of a type that expands when its temperature is reached.

  is raised above a predetermined critical point.

  A seat 25 for a spring surrounds the thermosensing bulb.

  17 and has a portion which is in contact with the conical surface 23. A main spring 26 has a lower end which is in contact with the lower part of the retaining member 12 and an upper end which supports

the seat 25.

  A movable or shutter member 27 surrounds a portion of the

  bulb 17 and comprises a metal ring 28 having a

  external funnel 38 which is located below the cylindrical seat

  14. A cover sheet 29 is disposed on the upper surface of the metal ring 28 and has a downwardly extending lip 31 which slides in the axially extending inner surface 15 of the cylindrical seat 14.

  annular disc 32 is disposed below the metal ring

  28 and has a concave curved surface 33 which

  convex surface 24 of the housing 18. The cover sheet

  29 and the annular disc 32 are both made of rubber or synthetic resin. An auxiliary spring 34 is disposed between the annular disc 32 and the spring seat 25. A contact member consisting of a disk-shaped plate 35 is attached to the booster 18 in the vicinity of its upper end and has a peripheral rim 36 which extending down. Small holes 37 are provided at the junction of the plate 35 and its peripheral rim 36 to allow the flow of liquid through these holes in

  certain conditions, as will be described later.

  The flow of coolant through the

  Valve occurs from bottom to top considering Fig.l.

  When the coolant temperature reaches

  a first predetermined level, the boot 18 of the bulb therm-

  mosensitive 17 moves axially downward, forcing the convex surface 24 of the housing to move slightly away from the concave surface 33. This movement is limited by the contacting of the peripheral rim 36 of the plate 35 with the cover sheet 29 of the movable member 27. A weak

  coolant flow then passes between the

  faces 24 and 33, through the central opening 39 of the organ

  mobile 27, and through the small holes 37 of the plate 35.

  When the coolant temperature has

  dyes the second predetermined higher value, the housing 18 of the bulb 17 moves even further towards the bottom to force

  the peripheral edge 36 to move the movable member 27 to the

  against the action of the main spring 26, the lower end

  upper casing 18 moving through the aperture 21 of

  the lower end of the retaining member 12. This movement

  As a result, the sheet 29 for recovering the

  27 slides into the surface 15 of the seat 14 until

  completely free from it. A current more

  important cooling agent can then pass

  under cylindrical seat 14 and above the sheet 29.

  Then, a temperature drop of the coolant

  As a result, the bulb 17 contracts axially, being forced by the main spring 26. The movable member 27

  first takes a closed position by entering into

  tact with the cylindrical seat 14, and the escape path between

  surfaces 24 and 33 are closed when the movement of the body

  gane 27 up was stopped by the contacting of the

  lower edge of the cylindrical seat 14 with the outer circumference

  dull 38 of the metal ring 28.

  It will be noted that the cylindrical seat 14 has a

  predetermined noticeable length in the direction of the moving

  Thus, before the member 27 can move to its open position, it must be axially displaced by a substantial predetermined distance.

  Therefore, to open the main valve, the temperature

  cooling agent must be maintained

  continuous operation at values above a pre-

  determined. This feature overcomes the incon-

  conventional thermosensitive control valves in which the main shutter is not moved on a

  such a predetermined large distance, which has the result that

  state of changes in the temperature of the coolant

  that cause repeated opening and closing of the valve, which in turn

  coolant passing through the main valve.

  This effect can result in an undesirable pumping of

the main valve.

Claims (3)

CLAIMS I   1 - thermosensitive control valve, characterized in that it comprises a frame (10) having a fixed seat (14), a   thermally sensitive bulb (17) having a mobile-axia / e-box (18).   arranged in the frame, a movable shutter (27) surrounding a portion of said thermosensitive bulb (17) and in axial sliding contact with said fixed seat, a surface (33) of the shutter (27) being adapted to come into contact with a surface (24) of said casing for closing a leakage path, resilient means (26) acting on the casing to keep said surfaces in contact and prevent flow between them, and a contact member (35) fixed to a portion housing (18), the latter moving in the desired direction to   opening a leakage path between said surfaces (24, 33) Izos-   that the temperature of the bulb (17) reaches a first level px-   determined, the shutter (27) remaining in the closed position against the fixed seat (14) during the boltier movement to open the leakage path, and said contact member   being adapted to move the shutter away from the fixed seat (14).   that the temperature of the bulb (17) reaches a second level pre- determined superior.   2 - valve according to claim 1, characterized in that a seat (25) of spring is in contact with the housing 118), said elastic means comprising a main spring '126) extending between the frame (10) and spring seat (25), -un   auxiliary spring (34) being interposed between the seat of res- fate (25) and said shutter (27).   3 - Valve according to one of claims 1 and 2, characterized   characterized in that said contact member (35) is a disk-shaped plate having holes (37) for passing   liquid passing through said leakage path.