US2499447A

US2499447A - Paint pressure box with heat exchanger

Info

Publication number: US2499447A
Application number: US591814A
Authority: US
Inventors: Axelson Eskil Anders August; Lofgren Carl Ake
Original assignee: Svenska Maskinverken AB
Current assignee: Svenska Maskinverken AB
Priority date: 1945-01-18
Filing date: 1945-05-03
Publication date: 1950-03-07
Anticipated expiration: 1967-03-07

Description

March 7, 1950 E. A. A. AXELSON ETAL 2,499,447

PAINT PRESSURE BOX WITH HEAT EXCHANGER Filed May 5, 1945 i l" 2 lo INVENTORS" E.A.A. AXELSON a CA. LOFGREN BY: W, fah v Ce.

AGENTS Patented Mar. 7, 1950 sesa e lisieriieierswet teex sers. ri; k w g-ren Stoekholrn, Sweden, assignorsjtoesvens lvfqskinaktiebolage icfireiff, Stockholm, Sweden, ricim flfi itfigmnfinyr I.

Anni}... Mamieserial. N9 5% 1 4:

It is known"in:sprayepistelseto heat the paint One channe1 system ID of the heat exch supplied t t ra iisto a nra aints-pre su :-is=.by -.me r1s-.ioi pipes .4 1? ene ate e box-attached to the pistol or---ir ,containen hot=.,compressed;air;source lias wellas v a However, in this case the paint has been heated cQimpressed.,ai l .-iri ,1et -]iipflth pi stol 4, an by means oi- -a heating coil or thic-like located moreover by. i -channe1 l reducing aroundor within the container, and the pressu e crs espectirel i. and passe ra a. air...

e Qhr@ dev ce.. s:.- nnectedrw h ii raw ck that: ttereach ll ctzshcrmt i iliewy si gin-Which involves much loss of time. Further, ch nnel (not shown) of the spray pistol. it is difficult to maintain the paint atthe same Having now described our invention, what we suitablalteinperature be fore theispraying temperature all the time because the temperaclaim as new and desire to secure by Letters ture of the paint will rise according as the quan- Patent is: tity of the paint decreases. Consequently, the 1. A paint pressure box for spray pistols compainting becomes different according to the temprising a paint container, a closure therefor, a perature of the paint. heat exchanger located in the upper portion of According to the present invention this drawsaid container and consisting of a metal block back is eliminated by the paint pressure box or having two series of parallel channels therein, container being provided with a heat exchanger means for flowing hot compressed air through. provided within or outside the same, one channel 1 one of said channel series, a connection from the system of the said heat exchanger being conlower portion of said paint container to the other nected to a source for heated compressed air, the v of said channel series, and means for flowing other channel system of the heat exchanger being hot compressed air into said paint container toconnected to the spray pistol and to the paint force paint through said paint connect on into receiving portion of the paint pressure box. said other channe1 series in heat exchange rela-- The invention is illustrated in the accompanytion with the hot air flowing in said first mening drawing in which Figure 1 is a side view ioner channe1 series. partly in section of a. spray pistol and attached h combination, with a p y gun a a; paint pressure box and Figure 2 is a top plan paint pressure box. of a heat exchanger comprisview drawn to a smaller scale of the heat exin a firs ch nne1 y em c mm ni n w h changer seen with the closure removed. a ou e Of t compressed gas a t e In the drawing the reference numeral I i'ndigun, a second dispen g channel system comcates the paint pressure box, 2 its cover whichmunicating with the lower part of the box and by a connection piece 3 is screwed on to the spray. with the gun, means for introducing compressed pistol 4. Into the cover thereis screwed a heat gas. to the interior of the pressure box. the two exchanger 5. In a preferred embodiment th 40 channel systems being of substantial length and heat exchanger consists of a heat exchange body in intimate heat exchange relationship, and 6,'preferably of a light material with good heat means for transferring the hot compressed gas conductability. In the body 6 there is a numfrom said first channel system after the hot gas ber of longitudinal channels 1 which through repasses therethrough, to said gun for atomizing

cesses

8, 9 at the ends are connected with.one the heated paint.

another to form two separate channel systems 3. The combination claimed in claim 2 where- IO and H, preferably with two or more parallel in the means for introducing compressed gas to branches. The recesses are made in such a way the box comprises a channel independent of the that they have a smaller flow areathan the rest first and second channel systems and communiof the channel systems. The body 6; is screwed cating with the first channel system and with the on to the cover-2 .of .the paint pressure box I top of the box. 4 so that said cover completes the channelsf'ormed 4. A paint p essure box for sp y ns h ying by the recesses 8. To the underside of the body a heat exchanger associated therewith, said heat 6 there is screwed a cover plate 12 completing exchanger comprising afirst channe1 system corr-v the channels formed by the recesses 9. nected between a source for hot compressed gas and a spray gun and which also communicates with the interior of the pressure box, a second dispensing channel system in heat exchange relationship with the first channel system and connected between the lower portion of the pressure box and the spray gun, the cross-sections of the channel systems and of the interior of the box being so proportioned that the major part of the gas flows through the first channel system and only a minor part enters the box, and means for transferring the hot compressed gas from said first channel system after the hot gas passes therethrough, to said gun for atomizing the heated paint.

5. A paint pressure box as claimed in claim 4, wherein the heat exchanger comprises a, body having parallel channels running therethrough and recesses at the ends of the body connecting the channels in groups to form two separate channel systems each with two or more parallel branches.

6. In combination with a paint pressure box for spray guns, a heat exchanger comprising a first channel system communicating with a source of hot compressed gas and with the spray gun, a second dispensing channel system communica ing with the lower part of the box and with the spray gun, the two channel systems being of substantial length and in intimate heat exchange relationship, means for introducing compressed gas to the interior of the pressure box, and means for transferring the hot compressed gas from said first channel system after the hot gas passes therethrough, to said heated paint.

7. The combination claimed in claim 6 Wherein the means for introducing compressed gas to the box comprises a channel independent of the first and second channel systems and communicating with the first channel system and with the top of the box.

8. The combination as claimed in claim 2 wherein the heat exchanger comprises a heat exchange body having parallel channels therein through which recesses at the ends are connected with one another to form two channel systems with two or more parallel branches.

9. The -'combination as claimed in claim 8 wherein the recesses have a smaller flow area gun for atomlzing the than the rest of the channel systems.

ESKIL ANDERS AUGUST AXELSON. CARL AKE LoFGREN.

REFERENCES one!) The following references file of this patent:

UNITED STATES PATENTS are of record in the Number Name Date 1,052,002 Kent Feb. 4, 1913 1,587,736 Schenck June 8, 1926 1,644,081 Prebel Oct. 4, 1927 1,737,347 Wilson Nov. 26, 1929 1,998,776 Collins Apr. 23, 1935 2,114,661 West Apr. 19, 1938' 2,148,986 Hoyt Feb. 28, 1939