Патент USA US2392087код для вставки
Patented Jan. 1, 1946 ' ' 2,392,087 UNITED~ STATE 5 PATENT OFFICE - ’ I 2,392,087 VENT VALVE FOR 'rnamuos'mrrc DEVICES ; William B. Griffith, some Harbor, N. J. ' Application November 2, 1943, Serial No. 508,723 3 Claims. (01. 297-3) thermostat, adapted for closing an electric cir-' My invention relates to improvements in ther cult, and embodying my invention. mostatic devices adapted for use in connection Fig. 2 is a view similar to Fig. 1, of a thermostat, with ?re protection systems, including apparatus adapted for operating a mechanical device, and adapted for closing an electrical circuit,- and for > operating mechanical releasing devices. My invention particularly relates to devices having an air chamber associated with a distend embodying another form of my invention. Fig. 3 is a central vertical sectional view or still another form of my novel vent valve, shown con nected with a thermostatic device.v able wall or diaphragm. movable by the pressure In the drawing, in which like reference char of expanded air in said chamber upon a sudden acters refer to like parts, Fig. 1 illustrates my in increase in the temperature of the air in the event 10 vention'embodied in a thermostat 5, which may of a ?re in the zone where the device is located. “be of any well known construction, having a. base The air chambers are now provided with slow '6, of insulating material, upon which is mounted leak vents through which variations in the pres-_ an air chamber 1, comprising a thin heat con sure or" the air within the chambers may equalize ' ducting metal shell and a distendable element, with the atmosphere without distending the dia~ or diaphragm W, the latter forming a wall of the phragms. The object of my invention is to provide a ther mostatic device with means for automatically closing the air chamber vent and sealing said chamber upon the occurrence of a ?re. A further object is to provide a novel vent valve for automatically closing the vent of an. air cham ‘oer at a predetermined temperature. A further object is to construct a valve which is normally movable to vent closing position and having fusible means adapted for holding the valve in vent opening position, during normal changes in temperature, and for releasing the valve at a predetermined temperature caused by a ?re within the zone where the air chamber is lo cated, whereby the expanded air will be con?ned within said chamber for quickly distending the diaphragm. I ' further object is to provide a novel valve cas ing adapted to be mounted upon an air chamber or connected with the latter, said valve casing having the air vent ‘formed therein, and means - air chamber l. The diaphragm it is electrically connected with a binding screw 02 by a conductor 53 and forms a terminal of an electric circuit. A terminal screw 55 is mounted upon the base 6 in spaced relation with the diaphragm and is con nected with a binding screw it, and said screw iii forms another terminal of the electric circuit. Said binding screws i2 and it are adapted to be connected in a ‘circuit ll, including a source of potential it and an energizable device it. The diaphragm it is adapted to be distended into con tact with the terminal iii, by air under pressure Within the chamber l, for completing the electric circuit, when the temperature or the air in said chamber is suddenly increased by the action of heat caused by a ?re in the zone where the ther mostat is located. In the construction of heat actuated devices having an air chamber and a diaphragm adapted to be distended by air under pressure it has been the practice to provide the air chamber with an adjustable slow ieak vent through which the air may equalize with the atmosphere during nor for positively moving the valve to vent closing position when. the valve is released by the melting 40 mal changes in temperature without distending the diaphragm. Devices having air chambers of the fusible means. with slow leak vents are disclosed in the patents A further object is to construct the valve cas ing with an adjustable slow leak vent, and a valve , to Cuttriss No. 522,972, July 17, 1894, and Himrner adapted i'cr closing said vent at a predetermined No. 1,174,149, March 7, 1916. My present invention consists of providing a temperature. 45 ~ A further object is to provide a‘ retaining mem ‘ ber engaging the valve and fusible means securing said retaining member positioned for holding the device having an air chamber with a vent valve adapted for sealing the vent of the air chamber, in the event of a ?re, so that the air will be posi tively retained in the air chamber and the in ' These together with various other novel fea 60 creasing air pressure utilized to distend the dia phragm and operate the device. tures of construction and arrangement of the The vent’ valve 20, as shown in Fig. 1, com parts, which will be hereinafter more fully de prises a valve casing 2|, having an axial bore 22 scribed and claimed, constitute my invention. and an‘ air inlet aperture 23 in communication Referring to the accompanying drawing? Fig. l is a-central vertical sectional view of a 65 with said bore and with the air chamber 1. valve invent opening position. 2,892,087 The casing 2| has a conical valve seat 25 sur rounding a vent 26 which is in communication in the pressure of air in the chamber '7 to equal izegwith the atmosphere without actuating the with the bore 22 and having an outlet aperture diaphragm III. In‘ the event of a ?re in the zone where the thermostat is located the fusible means '38 will melt and release the valve supporting member 53 and allow the valve 29 to move, or urged by the A valve 29 is mounted for movement within the action of the spring 3|, to vent closing position bore 22 and is normally movable toward the seat upon the seat 25, for retaining the air under 25 for closing the vent 28. Fusible means 30, in the form of soft solder, 10 pressure within the air chamber 1, thus distend . is provided for retaining the valve 29 in spaced , ing the diaphragm l0 into contact with the ter ‘relation with the valve seat 25. Said fusible minal screw i5, for completing an electrical icir means 30 is adapted for releasing the valve 29 cuit, or operating other well known devices. Another form of my invention is illustrated in at a predetermined temperature, whereby the valve will automatically close upon said seat, and 15 Fig. 2, which comprises a valve casing 50 having a body portion 5| extending without the shell form a closure for the vent 26 of the air cham ber ‘i. A spring 3| is provided for positively urg 52, of the air chamber 53. The casing 50 is se ing the valve 29 to vent closing position upon cured to the shell 52 by means of a cap 55 which is in threaded engagement with a reduced por the seat 25. A preferred form of my invention is shown in 20 tion 58 of the body-portion 5|. Said cap is adapt ed for tightly clamping the shell 52 between the Fig. v1, in which the valve casing 2| is mounted cap and the body portion 5|. The cap 55 is pro within the air chamber 1, with said inlet aper vided with an air inlet aperture 51 which is in ture 23 in communication with the chamber 1. The casing 2| has a reduced end portion 32 communication with the air chamber 53. , which extends through an aperture 33 formed 25 The body portion 5| has an axial bore 59 in through the shell, 8, forming the air chamber ‘I. which a conical valve 60 is mounted for move The casing 2| is tightly secured upon the shell ment to and from a conical valve seat 6|, formed upon the body 5| and surrounding a portion of 8 by a riveted ?ange 34. The valve casing 2| is provided with a detach the bore forming a vent 62-. A spring 94 tends ‘ able cap 35 which is in threaded engagement 30 to move the valve 60 to vent closing position ' 2‘l, communicating with the atmospherewithout I the air chamber 1, through a slow leak regulat-~ ing device 28, hereinafter more fully described. with the body portion of the casing 2|. upon the seat 5|. . The valve 29 has a cylindrical axial stem por The valve 88 is provided with a stem 85 which tion 35 and an enlarged'?ange 31 located adja is slidably mounted in the body 5|. Said stem cent to the conical head forming the valve prop 65 terminates adjacent to the. outer end of the er. Said stem portion 36 forms a shoulder 38, 55 body 5| and is held in vent opening. position of located adjacent to a reduced axial stem portion the valve 60 against the action of the spring 39 and engages the cap 35. Said portion 39 ex 54, by a supporting member 61, which latter is tends through an aperture formed through the secured directly to the body 5| by fusible means cap 35 and is freely movable relatively to the cap.v 68, fusible at a predetermined temperature. Said spring 3| is interposed between the ?ange 40 31 and the cap 35 and tends to urge the valve 29 to vent closing position upon the valve seat 25. As shown in Fig. l, the valve 29 is maintained ‘in vent opening position by a supporting mem ber 43, arranged for engaging a sleeve 44, se 45 curedupon the valve stem portion‘ 39, for hold The body 5|, of the valve casing, is provided with a lateral passage forming an air outlet ap erture 10 which is in communication with the vent 62. A sleev'e 1|, having an aperture 12, is adjustably mounted upon the body 5| and lo cated upon an axis extending at right angles to the stem 65, to allow the latter to extend through .the body 5|. Said sleeve ‘II is adapted for com ing the valve 29 against the action of the spring 3|. The opposite end of the member 43 is de pressing ?ltering material 13, for regulating the tachably secured, by said fusible means 30, to rate of ?ow of air through the outlet aperture a part of the thermostat which is exposed to 50 ‘Ill, between the air chamber 53 and the atmos- sudden changes in temperature, it is preferably phere, when the valve 69 is in vent opening po-‘ secured to the inner surface of the shell 8, so sition. ' that an increase in temperature, due to a ?re, The thermostatic device shown in Fig. 2, with will melt the fusible means 30 and release the which my invention is embodied, consists of said member 43, which in turn will release the valve 55 air chamber 53, formed by the rigid shell 52. The 29 and allow°the latter to move to vent closing chamber 53 is connected by a pipe 15 with an ex position, or urged by the spring 3|, should the pansion chamber ‘I8, having a distendable wall, valve, be mounted for movement ‘upon some axis or diaphragm 11, which latter is adapted for re out of a vertical position. leasing levers 18 and 19. The lever 79 is adapted The valve supporting member 43 may be 60 for rotating a shaft 80, by the action of a weight formed of spring metal having sumcient resil 8|, when released by the movement of the dia iency for holding the valve 29 in the open posi ' phragm 11 by pressure of expanded air in the tion against the action of the spring 3|, thus chamber 53, responsive to the action of heat ap eliminating the'necessity of locating the mem plied to the shell 52. Devices of this character ber 43 in an exact position upon the shell 8. are well known in the art. ' ' The valve casing 2| is provided with said slow Fig. 3 illustrates a form of my invention simi leak regulating device 28, which is mounted di iar to that shown in Fig. 2, with the exception rectly upon the valve casing 2|. 'Said device 28 that. the valve 88 is held-in vent-opening posi is of standard construction and comprises a ‘ tion by fusible means 82, which is secured direct sleeve 46, having an ori?ce 41, in communication ly to thevalve stem 85 and to the outer end of with said outlet aperture '21. Said sleeve 46 is the body 5| of the valve casing 50, thus eliminat in threaded engagement with the casing 2| and ing the. use of the supporting members 43 and is'adapted for compressing ?ltering material 48 61, shown in Figs. 1 and 2. for regulating the rate of ?ow of air from the air chamber 1, thereby permitting slow changes In Fig. 3 the valve casing 50 is shown provided with a threaded air inlet aperture 83,-for the ‘ ascaoav connection of a pipe 84, which is in communica 3 chamber 86, similar to the expansion chamber T6, shown in Fig. 2, is shown connected with the movement of the stem by the action of the spring, and said ‘fusible means adapted to fuse at a predetermined temperature to release said plate and permit the valve to close upon said seat. air chamber 85 by a pipe 81 and said pipe 84. When the fusible means 82 fuses, the valve 2. In a thermostatic device having a metal shall forming an air chamber, a distendable ele I stem 65 will be released from the valve casing ment adapted to be distended by expanded air in said chamber responsive to heat, a valve casing mounted upon said shell, said casing having a longitudinal bore in communication with said chamber, a valve seat upon said casing surround tion with an air chamber 85.. An expansion ‘ 50, and the valve 60 will be moved to vent clos ing position by the action of- the spring 64, thus retaining the air in the chamber 85 and in the expansion chamber 86 foroperating a releasing device, as above described. ing said bore, said casing having a vent forming The operation of my invention is as follows: a communication between said bore at the axis of The valve casing is provided with an air passage said seat and the atmosphere without said cham forming a vent through which normal changes 15 ber, a valve stem mounted for axial movement in the air pressure within the air chamber may within said bore, a valve mounted upon said equalize with the atmosphere, during slow stem, a spring tending to slide said stem axially changes in the temperature of the air surround for closing the valve upon said seat, said stem ing the air chamber, without distending the dia having an end portion extending from said cas phragm. The valve casing is provided with ad 20 ing into said chamber, a valve supporting plate justable means for varying the rate of flow of having one end portion extending radially at the air through the vent so that a sudden in right angles to the, axis of the stem, means upon ‘ crease in thetemperature, due to a ?re, will cause said end portion of the stem adapted to be en the diaphragm to be distended and operate the gaged by said plate, fusible means securing the device. Should the increase in temperature be opposite end of said plate upon the inner surface slow, due vto a smouldering ?re, the pressure of said shell, said plate having su?icient rigidity within the air chamber may equalize with the for holding the stem against the action of said atmosphere without distending the diaphragm. spring for normally maintaining the valve ‘in My novel vent valve provides means for posi spaced relation to said seat. and said fusible tively sealing the air chamber when the fire in 30 means responsive to heat at a predetermined creases su?lciently to melt the fusible means. temperature for releasing said plate for move The fusing oi the iusible means releases the valve ment of the valve to vent closing position upon proper for movement to vent closing position, said seat. thus retaining the air within the air chamber. A 3. In a thermostatic device having an air further increase in temperature causes a further 35 chamber, a distendable element adapted to be increase in the pressure of'the air in. the air distended by the expansion of air in said cham chamber, which pressure distends the diaphragm ber responsive to heat, a valve casing having a for operating a device adapted for fire protection bore in communication with said chamber, a purposes. ‘ valve seat upon said casing surrounding said Various changes in the construction and ar 40 bore, said casing having a vent in communica rangement of the parts may be made without de tion with said bore at the axis of said seat and parting from my invention. in communication wtih the atmosphere without I‘ claim: said chamber, a valve stem mounted for move 1. In a thermostatic device having a metal ment upon the axis of said bore, a valve mounted shall forming an air chamber, a distendable ele F upon said stem, a spring tending to close the ment adapted to be distended by expanded air in valve upon said seat, fusible means supporting said chamber responsive to heat, a valve casing said stem with the valve in spaced relation to mounted upon said shell, said casing having a said seat and adapted to release the stem at a longitudinal bore in communication with said predetermined temperature for movement of the chamber, a valve seat upon said casing surround 50 valve to vent closing position upon said seat, a ing said bore, said casing having a vent forming sleeve upon the casing located in said vent be a communication between said seat and the ‘at tween said seat and the end of the vent which is open to the atmosphere, said sleeve having an mosphere without said chamber, a valve stem mounted for axial movement within said bore, a ori?ce in communication with said vent, and valve mounted upon said stem, a spring tending 55 means for adjusting said sleeve upon the casing to slide said stem axially for closing the valve for varying the size oi’ said vent independently upon said seat, a valve supporting plate extend oi’ the position of said valve relatively to said ing radially at right angles to the axis of said / seat. stem, fusible means securing said plate posi tioned upon the axis or the stem for opposing the WILIJAMB.GRIFFITH.