Патент USA US2106668код для вставки
Jan-25, 1938. P. H. THOMPSON. 2D 2,106,668 THERMOSTATIC FITTING ‘Filed Nov. 21, 1935 i Patented Jan. 25, 1938 2,106,668? UNITED STATES PATENT OFFICE 2,106,668 THERMO‘S TATIC FITTING Parke H. Thompson, II, Maplewood, Mo., as signor to Alco- Valve Company, Inc., St. Louis, Mo., a corporation of Missouri Application November 21, 1935, Serial No. 50,991 '7 Claims. This invention relates to thermostatic ?ttings of general applicability, but especially designed duits, and corresponding to the temperature of the refrigerant within the conduit. Prior to the advent of the present invention, A further object of the invention, in connec tion with that form in which the bulb follows the bend of a ?tting, is to position the bulb so that its surface will be angularly impinged by the ?ow ing refrigerant, thereby scouring away any sur face ?lm of inert refrigerant which ordinarily to be intercalated in refrigerant-carrying con some manufacturers of mechanical refrigerators would cling to the bulb. have been content to merely place the thermostat in the refrigerated chamber, where it responds to the temperature of the refrigerated atmosphere. Others have effected a compromise by clamping the thermostat against the refrigerant conduit, so that it responds to the composite temperature of the refrigerant and the atmosphere of the refrig erated chamber, but the placing of the thermo Another object of the invention. is to locate the bulb in the conduit closer to the bottom wall than to the other walls, so that it will be bathed in a 10 stratum of the denser gas. Other objects of the invention will appear as the following description of a preferred and prac tical embodiment thereof proceeds. static element in either of these locations is un of which the same characters of reference have satisfactory, for it responds to spurious condi been employed to designate identical parts: tions, such as caused by the momentary opening of the refrigerator door. It has been proposed to enclose the thermo static bulb within the refrigerant conduit, but the means for doing so, up to the present time, have been difficult or expensive'to construct and install, or have formed an obstacle to the normal ?ow of the refrigerant. The general object of the present invention is to provide a ?tting, either of straight or bent In the drawing, throughout the several ?gures Figure 1 is a longitudinal diametrical section through a straight ?tting embodying the prin ciples of the present invention; 20 Figure 2 is a cross section taken along the line 2--2 of. Figure 1; v Figure 3 is a longitudinal diametrical section through an elbow-shaped ?tting; . Figure 4 is a vertical axial section taken at 25 right angles to the view shown in Figure 3, the ' lower portion being broken away; form, adapted to be interposed between the ad Figure 5 is a cross section similar to that of jacent ends of a refrigerant conduit so as to form Figure 2, but showing a slightly modi?ed form of the invention; and 30 30 part of the said conduit, and enclosing as a uni tary part thereof, a thermostatic bulb spaced from the walls of said ?tting and having an end con struction which minimizes its obstruction to the ?ow of refrigerant through‘the conduit. Another object of the invention is to provide 35 Figure 6 is a cross section taken along the line 6-—6 of Figure l. > a ?tting having a thermostatic bulb arranged Referring now in detail to the several ?gures, and ?rst adverting to that form of the invention illustrated in Figures 1 and 2, the ?tting l is con stituted by standard end connections 2 and 3,. therein and supported laterally from the walls which may be similar and, as shown, are threaded of said ?tting. and of the solderless type, it being understood _ A further object of the invention is the provi sion in a thermostatic ?tting, as described, of lat eral posts supporting the bulb, the‘posts being hollow so that one can form a portion of the tube which places the bulb in communication with the control element of the thermostat, while the other 45 post may be utilized for ?lling the bulb and its appurtenant instrumentalities with the volatile ?uid. Still another object of the invention is to streamline the ends of the bulb so that the ?ow 50 ing refrigerant does not create eddies'and back pressure at the forward end of the bulb, and causing the refrigerant to follow the surface of the bulb to its rearward end, making the thermo stat extremely sensitive to the temperature of 55 the ?owing refrigerant. of course that the construction of the connec tions as shown is exemplary only and that any 40 other form may be employed without transcend ing the scope of the invention. Said connections are provided at either inner end with annular rabbets 4 and 5, constituting a seat for the ends of the cylindrical section or barrel 6, which cylindrical section is preferably soldered to the end connections as is indicated at ‘I. ' The end connections are bored as at 8, so as to make the ?tting a continuation of the refrig 50 erant or other conduit in ‘which the ?tting is intercalated. The diameter of they intermediate section or barrel 6 is larger than the diameter of the bores 8. Within the barrel 6 is a thermostatic bulb or‘ 55 2,. .. capsule 9. This was inserted into the barrel 6 2,106,668 before the latter was secured to the end connec tions 2 and 3, and secured in place within said barrel by means of posts l0 and II, which pass laterally from the interior of said barrel to the exterior through apertures I2 and I3 formed in a wall of the barrel. The posts are suitably se cured to the wall of the barrel 5 by solder or any other suitable means. The posts l0 and‘ H are preferably hollow, and one of the posts, for ex ample, the post l9, forms a continuation on the outside of barrel of the tube M which leads to the coming gas, so that the gas impinges at an angle upon the surface of said bulb, in the zone indi cated by the brace l1, scouring this portion of the bulb I8 thoroughly and removing the inert gaseous refrigerant which would ordinarily cling to the bulb l8 through skin ?lm. This makes the bulb extremely quick in its response to the changes in temperature in the ?owing refriger ant. ' > It is obvious that in constructing that form of 10 the invention shown in Figure 3, the bulb [8, to— gether with the posts l0 and II are made suffi ciently short to pass into the barrel 2|, are in troduced into said barrel and the posts aligned with apertures suitably placed in the wall of said 1,5 expansible motor, not shown, actuated by the thermostatic element. The thermal insulation of the bulb 9 is assisted by making the posts of metal of low conductivity . barrel and then pushed slightly so as to extend and by restricting their cross section to the mini through to the outside of said barrel where the mum area so as to reduce the rate of heat ex . change with the metal of the enveloping conduit 20 to a minimum. Since it may be desirable to pro vide auxiliary support for posts of such restricted cross section, ?ller pieces 25, see Figure 1, may be provided surrounding the posts I0 and II and against which the tube 9 rests. The ?ller pieces are preferably of non-conductive material such as a phenolic condensation product and they may be streamlined in the direction of ?ow through the conduit, as indicated at 26 in Figure 6. The wall of the tube 9 is preferably made as 30 thin as possible so as to obviate any substantial metallic reservoir of latent heat which would re tard the response of the thermostat to tempera ture changes of the fluid within the conduit. The tube II also may be hollow and serves as 35 a means of ?lling the thermostatic capsule with volatile ?uid. Upon completion of the ?lling op eration, the post I I is permanently sealed off. It will be observed in Figure 1 that the oppo site ends of the bulb 9 are tapered, coming sub stantially to a point at IS. The ends of the bulb may thus be described as streamlined, which shape operates to cleave the ?owing refrigerant gas ‘so as to prevent eddies and back pressure against the anterior end of the bulb 9. The 45 gas thus cleft flows with substantially undimin ished Velocity, through the annular space l6, be tween the bulb 9 and the inner surface of the barrel 6, and exits from the ?tting by way of the end connection 3. The posterior end of the bulb 9 is streamlined so as to direct the flowing gas down close to the surface of the thermostat in the rear, thereby making the bulb substantially one hundred percent efficient in its response to temperature variations of the refrigerant. . Figures 3 and 4 show an elbow ?tting adapted to be interposed between adjacent‘ ends of a re~ frigerant conduit and to form a bend in said conduit. In this form of the invention, the end ‘conections 2 and 3 are the same as in that form 60 of the invention ?rst described. The barrel 2|, as shown, has the form of a long sweeping right angled curve or elbow. It is soldered to the end connections in the same manner as ‘in Figure 1, and the bulb is likewise streamlined at the ends. The bulb is supported away from the sides of the barrel 2| by the hollow posts l0 and II which extend laterally through the side wall of the ?t ting. The posts lead respectively to the tube I0 which serves the expansible element, not shown, 70 and to a ?lling source, not shown, by means of which the bulb I8 is charged with volatile ?uid, after which the tube l l is sealed off. > The form of the invention illustrated in Figure 3 has the advantage that the surface of the bulb ‘is disposed at an angle to the direction of ‘the in post I0 is then connected so as to form part of the tube 24. After the bulb l8 has been ?lled, the post Il may be sealed off by pinching it to 20 gether or by soldering, or in any other suitable manner. Figure 5 shows a slight variant of the inven tion applicable either to the straight or bent type ?tting, in which the bulb I9 is eccentrically 25 mounted within the barrel 20, so as to lie closer to the bottom wall of the said barrel than to the other walls. In this position, it is bathed by the stratum of the denser gas passing through the 30 conduit. It is obvious that the ‘above invention realizes the construction of 'a' thermostatic ?tting which isisimple and inexpensive to construct, easily in stalled, and which offers the minimum of resist; ance to the ?ow of the refrigerant gas through 35 the conduit in which it is interposed. It will be understood to those skilled in the art that the spec1?c details of construction and the arrange~ ments of the parts as herein disclosed and de scribed is merely by way of example and not to 40 be construed as limiting the scope of the inven tion as claimed. - What I claim is: 1. Thermostatic ?tting comprising an open ended tube, nipples at the ends of said tube and 45 connected thereto, said nipples being threaded for connection to a conduit, a thermostatic bulb in said tube, posts extending through a wall of said tube in longitudinally spaced relation support ing said bulb adjacent its ends in spaced relation 50 to the wall of said tube, said posts being hollow and communicating with said bulb, one of said posts communicating externally of said ?tting with an expansible actuator operated by said 55 thermostatic bulb and the other being sealed hav lng served as a means for charging volatile ?uid into said bulb. , ' 2. Thermostatic ?tting comprising a conduit, a thermostatic bulb in said-conduit, a hollow post 60 Supporting said bulb in spaced relation to said conduit, the material of said post being of mini mum cross sectional area to throttle the exchange of heat through its metallic mass, and auxiliary supporting ‘means comprising spacing pieces of 65 thermally non-conductive material surrounding said post and engaging said bulb and conduit. v3. Thermostatic ?tting comprising an open ended tube, nipples at the ends of said tube and connected thereto, said nipples being adapted for connection to a conduit, a thermostatic bulb ex tending longitudinally in said tube, having wedge-shaped ends confronting the bores of said nipples, posts extendingthrough a wall of said tube in longitudinal spaced-‘relation supporting 2,106,668 3 said bulb adjacent its ends in spaced relation to _ said bulb having wedge-shaped endsv confronting the wall of said tube, said posts being hollow and communicating with said bulb, one of said posts communicating externally of said ?tting with an expansible actuator operated by said thermostat, and the other being sealed, having served as a means for charging volatile ?uid into said bulb. 4. Thermostatic ?tting comprising an open ended tube, nipples at the ends of said tube and 10 connected thereto, said nipples being adapted for the bores of said nipples. 6. Thermostatic ?tting comprising a conduit, a thermostatic bulb in said conduit spaced from the walls thereof, a tube communicating with said bulb and adapted to lead ?uid under pressurev therefrom to a thermostatically controlled device, ' and an element made of thermally non-conductive material surrounding saidtube and supporting said bulb in heat insulating relation to the me 10 connection to a conduit, a thermostatic bulb in tallic mass of said ?tting. said tube, said tube and bulb being curvilinear about a common center, posts extending through 7. Thermostatic ?tting comprising an open, ended tube, a thermostatic bulb in said tube, posts extending through a wall of said tube in a wall of said tube in longitudinally spaced rela 15 tion supporting said bulb adjacent its ends in spaced relation to the wall of said tube, said posts being hollow and communicating with said bulb, one of said posts communicating exter 20 nally of said ?tting with an expansible actuator operated by said thermostat, and the other being sealed, having served as a means for charging volatile ?uid into said bulb. 5. Thermostatic ?tting as claimed in claim 4, ' ' longitudinally spaced relation supporting said 15' bulb adjacent its ends in spaced relation to the wall of said tube, said posts being hollow and communicating with said bulb, one of said posts communicating externally of said ?tting with an expansible actuator operated by said thermo 20 static bulb and the other being sealed, having served as a means for charging volatile ?uid into said bulb. _ PARKE H. THOMPSON, II.