US2208869A - Expansion device - Google Patents

Description

July 23, 1940.A A. LANGEQKl-: 2,208,869

EXPANSION DEVICE Filed May 21, 1937 Z22/afan @22% f@ Patented duty 23, vll FT N i ,tres

sacaste armansroai navos Application .May 21, 1937, Serial No. 144,102l in Germany `lune 26, 1936 claims. (ci. sra-116)' orator and heat would be abstracted from the In the known valves of this kind surroundings.

it was necessary to arrange valso the adjusting l device serving for the control of the valve close to the evaporator. The space available for the 1 5 accommodation of the goods to be cooled was thereby reduced; and furthermore, special precautions had to be taken to avoid the adjusting devices freezing up. In order to meet this drawback, the `relief-valve was also frequently ar 20. ranged outside the refrigerating chamber; in this case, either the reduction of the refrigerating efliciency due to the evaporation of the refrig' erant in the feed pipe and the formation of hoar *frost on this pipe thereby occurring had to be put u p with, or this pipe had to be provided with heat insulation, which caused an additional con-` sumption of material and increased costs of construction. In a known construction, the lindeA sired evaporation of the refrigerant in this pipe 3@ was obviated by an excess pressure valve, ar` ranged behind the relief-valve situated outside the refrigerating chamber, namelyin proximity to the evaporator. This valve was to increase the pressure in the feed pipe to such ar extent' 3@ that no evaporation that detrimentally ailected the refrigerating emciencycouid take place and thus also no formation of hoar frost on this pipe. In order to save this additional valve, in another known construction the adjusting memw ber was arranged, at least partly within the insulating wall of, the .refrigerator cabinet, and connected to the valve situated close to the evaporator by a long valve spindle. This arrangement presupposes very denite constructional conditions and the refrigerating plant can in this case only be connected to the refrigerating cabinet in the manufacturers workshop, and both parts can only be despatched together as a unit. The refrigerating plant can thus not be subsequently combined with the'cabinet and removed therefrom 'for the purpose oi making repairs.

The invention enables the adjusting device to be left outside the refrigerating chamber, for ing stance in direct proximity to the condenser, so

This valve is preferably arranged in the that the refrigerant cannot evaporate in the feed i pipe, without such constructional limitations as vaect the form of the refrigerating device. ThisJ is attained by the valve member arranged in the refrlgeratingy chamber close to the evaporator `5 being connected, according to the invention, to the adjusting member situated outside the refrigerating chamber by a remote-control device, which is carried round the boundary edges ofthe substantially unpierced partition wall situated 10 between the refrigerating chamber and the machine chamber. As a remote-control member, a `flexible pull-and-push member, guided in a narrow tube, but comparatively rigid in the axial direction, or so-called Bowden wire, can preferla ably be used, the guide tube of which can serve at the same time for the conveyance of the refrigerant to the valve. As in the arrangement,

" according to the invention, care is certainly taken that the refrigerant cannot evaporate in the feed 20 pipe, this pipe need not be provided with heat insulation, and the whole plant can therefore be easily inserted subsequently in `the refrigerator cabinet, and, in case of need removed therefrom.

Two examples of construction of the invention 25 are* shown in the accompanying drawing, in

Figure l shows a refrigerating plant for a dojmestic refrigerator cabinet having a remote-controlled controlling valve according to the inven- 30 tion.

Figure 2 shows in section and on an enlarged scale, an example of construction of the controlling device shown in Figure 1 and the corresponding adjusting device. Figure 3 shows another construction of the doet-controlled valve,

Figure 4 shows on' a larger scale the valve member used in the construction shown. in Figl ure 3, and., o

Figure 5 shows an auxiliary device to facilitate the screwing oi of the valve.

The refrigerating plant shownin Fig. 1 consists essentially of the motor compressor lil, the liquefler il, and the evaporator i2. To the lat- 5 ter a collecting vessel i3,is connected, whichcommunicates by a suction pipe M with the suction side of the motor compressor. 1n the piping i5, 25 leading from the liqueer to the ev porator a float container I8 is intercalated, w ch likethe motor compressor l0 and a fan l1 serving for the conveyance of the cold Vair from the liqueer, is arranged on a supporting frame I8, mounted by'means of elastic rubber cushions I9 on the cover 2li of a refrigerating chamber 2|.

As Figure 2 shows, a float 24 lis arrangedin v the float casing I8 which is provided with a pipefloat, even when the part 25 of the pipe for the refrigerant serving for the cable is bent several times in fitting the refrigerating plant in the refrigerator cabinet.

The whole refrigerating plant can thus, as shown in Figure 1, be arranged on both sides of i the unpierced partition wall, so that the valve casing 23 remains in proximity to the evaporator I2, that is, in the refrigerating chamber 2|, while the float container I6 is arranged outside the refrigerating chamber. 'I'he remote transmission means, formedby the refrigerant pipe 25 and the -wire cable 21, may like the suction pipe I4, be so curved, when fitting that the plant put together in the workshop, filled with refrigerant and oil, and tightly closed, can be adapted to the 80 partition wan `2n and 1am most varied constructional conditions. 4The pipes I4 and 25 are led to the front end face of the in a comparatively shallow and narrowgroove 3l provided in this face, which, if necessary, can also be perfectly tightly closed by fibrous material or other loose packing'medium. The end face is covered at the front by a covering strip 32. The free cross section between the container I6 and the float 24 is comparatively narrow, so that even slight fluctuations in the amount of refrigerant in the container cause great alterations in the level of the liquid, and thus also can produce great adjusting movements and forces. In this way, the play, never quite avoidable in such a so-called Bowden wire, can be compensated for, and thus a working of the valve that corresponds to all practical requirements is obtained. In case, more especially in large refrigerating plants, the'in- Aternal cross section of the guide-tube 251 left free by the wire cable 21 should not permit asuflicint passage for .the refrigerant, a special refrigerant pipe-of larger cross section can be arranged between the float container I6 and the valve casing 28, in the inside of which the guidetube 25 is preferably placed. L" The cable 21 in this tube is preferably formed by a closed wire helix, whose coils wound with a comparatively small pitch enclose a bundle of thin wires, which are not, or only .slightly twisted. It has been v.found that such a transmission member can be moved in its ,guide-tube without substantial frictional losses even when it has curves of comparatively small diameter.

Of course, the valve 30 and the float 24 may be connected, if desired, by any other known remotecontrol device. Instead of the float any other adjusting device, for instance a diaphragm influenced by the pressure in the suction pipe, or anothery adjusting member customary in combination with a relief-valve, may, if required, be utilized for operating the valve 30.

In the example of construction shown in Figs. 3 and 4., a holder 32, provided with a collar part 3|. is connected to the wire cable 21 connected by a lever 23 to the float 24, and guided in a narrow -feed pipe 25, the holder being loaded by a spring 33 bearing against the inner end wall guidance of the wireof the casing 28. A valve-seat 33 combined with a guide 31 to form one constructional unit is tightly inserted against a shoulder 40 in the casing 28 by means of a thread 4I, which servesat -the same time for seeming a closure member 42 yconnected to a refrigerant pipel I2.V The valve member 30 is provided with a thread 34 and with a constriction which is somewhat ,longer than l the collar part 3l of the holder and the internal thread' 36 therein. At the constriction 35 the diameter of the valve member is somewhat smallerV` than the diameter of the threaded portion 34 so that when the parts are in the position shown in Fig. 4, the valve member 30 is loosely fitted in or connectedto thecollar part 3l of the holder 32. 'I'he valve member can thus place itself obliquely relative to the holder to a triing extent. 'I'he advantage is thereby obtained that no frictional forces that prejudiclally effect the easy movability of the valve can occur in the valve-guide 31 if there is a transverse strain in the wire cable 21', or if in the fixing of the holder 32 to the wirelcable 21, or in the insertion of the valve seat 28 provided with the guide 21, these parts should not lie exactly co-axial in the centre line of the valve. The play necessary for this purpose between the constriction and theV internal thread of the part 3| amounts only to about 0.1 mm. and thus practically does not at all affect the exactitude of control.

The clamping sleeve v42 shown in Fig. 5 may be employed for the insertion and screwing out of the valve member. proximately semicircular tongues 44, divided by slots 43, and which are somewhat externally expanded. The tongues can be clamped on the valve member by pushing a clamping ring 45 over two externally projecting recesses 46 in the wall of the sleeve.

The constrictionbetween the thread and the shaft used in this construction may also be emy ployed with advantage in other valves in order.

to avoid a jamming of the valve member in its guide. l

I declare that what I claim is:

1. A refrigerator comprising a refrigerating chamber having a substantially unpierced wall situated between the heat absorbing and heat delivery parts of the refrigerator, `a compressor, a liqueiler connected to said compressor, an evaporator in .said refrigerating chamber, conduit means connecting one end of said evaporator to said compressor and the other end to said liqueiier, a portion of said conduit means extending around the boundary edge of said wall, a valve member arranged in said conduit means between said liqueer and said evaporator and in the refrigerating chamber, in proximity to said evaporator, a control member arranged in said conduit means outside of said refrigerating chamber, and a remote control device operated by said control member to actuate said valve member, said remote control device extending around the boundary edges of said wall.

2. A refrigerator comprising a refrigerating chamber having a substantially unpierced wall situated between the heat absorbing and heat delivery parts of the refrigerator, a compressor, a liquefier connected to said compressor, an evaporator in said refrigerating chamber, conduit means connecting one end of said evaporator to said compressor and the other end to said liqueer, a portion of said conduit means extending around the boundary edge of said wall, a valve member arranged in said conduit means between said liqueer and said evaporator and in the refrigeratng chamber, in proximity to said evaporator, a control member arranged in said conduit means outside of said refrigerating chamber, and a Bowden wire extending around the boundary edge of said wall and connecting said control member and said valve member.

3. A refrigerator comprising a refrigerating chamber having a substantially unpierced wall situated between the heat absorbing and heat delivery parts of the refrigerator, a motor compressor. a liqueier connected to said compressor, an evaporator in said refrigerating chamber, conduit means connecting one end of said evaporator to said compressor and the other end to said liqueer, a portion of said conduit means extending around the boundary edge of said wall,

a control member arranged-in said conduit means outside of lsaid refrigerating chamber, a valve member arranged in said conduit 'means between said liqueer and said evaporator and in the refrlgerating chamber in proximity to said evaporator, and a Bowden wire arranged in said conduit means and operated by said control member to actuate said valve member.

4. A refrigerator comprising a refrigerating chamber having a substantially unpierced wall situated between the heat absorbing and heat delivery parts of the refrigerator, a motor compressor, a liqueiier connected to said compressor, an-evaporator in said refrigerating chamber, conduit means connecting one end of said evaporator to said compressor and the other end to said liqueer, a portion of said conduit means extendingaroundtheboundaryedgeofsaidwalLa' valve casing arranged in said conduit means beed in said hole, a control member outside of said.

refrigerating chamber, and a remote control device operated by said control member to actuate said holder and said valve member, said remote control device extending around the boundary edges of said wall.

5. A refrigerator comprising a refrigerating chamber having a substantially imperforate wall between the heat absorbing and heat delivery parts of said refrigerator, al compressor, a liqueer connected tosaid compressor, an evaporator in said refrigerating chamber, conduit means connecting one end of said evaporator to said compressor and the other end to said liquener, a portion of said conduit means extending around the boundary edge of said wall, a valve member arranged in said conduit means between said liqueiierand said evaporator and in the refrigerating chamber in proximity to said evaporator, a control member arranged in said conduit means outside of said refrigerating chamber, and a remote control device arranged in said conduit and operated by said control member to actuate sai valve member. f

ALFONS /LANGECKER

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