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Патент USA US2110884

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March 15, 1938.`
F; C. LEONARD ET Ax.
'
2,110,884
THEBMOSTATIC DEVICE
Filed May 2l, 1952
I
`
.
2 Sheets-Sheet 1>
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iœntenteei Mar. lig, lg3d
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Frederick C. leonard, Cranston,
Ross, Providence, lit. ll.
Adpplication lil/Hay 2li, 'lità-EZ?,
itc. iiläßßëß
6 Ciaiins.
Ourv present invention relates to thermostatic
mixing regulators, and has particular reference
to regulators for ‘maintaining a desired tempera
. ture of flowing Water.
’
,
The principal object of our invention is to de
vise a thermostatic regulator of inexpensive con
struction, adapted to control iiuid `flows accu
rately,¿and capable of maintaining the tempera
ture of the ñowing fluid substantially constant.
A further object of our invention is to design
the mixing chamber and theñow area so as to
ensure adequate mixing oí the hot and cold
streams prior to contact with the thermostaticv
element.
15
,
-
An additional _object of our invention' is to
devise valve constructions which are not changed`
in setting by variations and relative differences in_
the pressures of the hot and cold fluids. .
Another object of our invention is to pro-vide'
20 a regulator construction that is extremely rug
ged, is not easily deranged, and cannotbe ren
dered inoperative short of actual' breakage.
Withzthe above .and other objects and advan
tageous features in View the invention consists
_25 of a novel regulator construction and a novel
inlet flow control therefor, more fully disclosed in
the detailed description following, in conjunction
`with the accompanying drawings, and more par
ticularly deñned in the claims appended thereto.
30
In the drawings,
.
Fig. 1 is a top plan view of the novel regulator;
Fig. 2 is a view thereof with the front portion
removed, showing the flow control valve;
Fig. 3 is a section on the line 3-3 of Fig. 1;
35
Fig. 4 is a section on the'li'ne 4-4 of Fig. 3;
Fig. 5 is açbottom View of the front‘portion,
showing the thermostatic coil;
Fig. 6- is an enlarged view of the valve
'
'
and valve '
seat;
40
Fig. 7 is a section of Fig. 6 on the line 'l-Í-l;
and screw threadedly or otherwise engage the
flange
i2.
'
,
'
As best shown in Fig. e, the back member has
two inlets, it, lll threaded to receive the corre
spondingly threaded ends iii; it of inlet-conduits
for ñuids of different temperatures. The incom
ing ñuids enter chambers ift, 2i in which cylin
dn‘cal strainers 22, ‘23 are mounted, the' strainers
being secured at the`r outer endsv to caps 22d, iti
which'are threaded )in suitable openings in the
ends of the chambers andare thus adapted to be
readily removed for cleaning. The inner ends of
the strainers engage the ends of bearing nipples
2li, 25 which are screw threadedly vmounted at the
other ends of the chambers, and have recesses
2G, 2l which receive the ends of an inlet cylinder
2B which .as shown is provided with a partition 29
or the like to keep the entering fluids from mix
ing. The cold side of the inlet cylinder has three
' lateral ports 3&9, and the hot side hastwo lateral
ports 3l, these ports being controlled by a slide
valve 32,' having opposed conical faces 3d and a
central groove tt for receiving the operating arm
ofthe thermostatic control, as hereinafter de
scribed. The inlet cylinder is positioned so as to
direct the-inñowing streams of fluids generally
away from the thermostatic coil», thus producing
mixing before the fluids reach the thermostatic
coll.
Referring to Figs. 2 and 5, now, the front mem- .
ber is cup-shaped to house the thermostatic ele- `
ment 35, this element being formed as a spiral
coil.. An operating shaft 3B is rotatably mounted
in the central bushing 31 of the front member,
which is recessed to receive the usual packing 33
held in place by the flange nut 39 which screw
threadedly seats- in the central bushingA recess.
The end-l of the operating shaft is reduced slightly
r. to form a shoulder dû, and seats in a bore 4i _of a
thrust bearing member 42 provided in the back 40
Fig. 8 is a section of Fig. 6 on the line 8_8; and ' member, whereby the operating- shaft and its
operating parts cannot be forced down, as for
Fig. 9 _is a sectional >view of a -modified con
example by a blow on the handle or the end of the
struction of the valve and v'alve seat.
_
shaft, so as to damage the valve mechanism.
-Referring to the drawings, the improved regu
_ A radial plate 43 is pinned or otherwise se 45
45 l‘ator comprises a front member i0 in which the cured to the shaft 36, and is bent over at its end
ì thermostaticeleinent, the setting mechanism, and
to provide a lock plate M which is riveted or
the valve operating mechanism are housed, and
va back member l i in which the valve mechanism
0 is housed, both members being preferably cast
of brass. The back and front members lhave an
nular machined flanges l2, I3 between which a
'packing I4 is positioned, the two members being
secured-together' by screws or the-like i5 which
55 pass through suitable openings in the ñange i3
otherwise secured to the outer end of the ther
mostatic coil. A thimble ¿iii is rotatably mounted
cn the `shaftl 3% and is secured to the'inner end 50
of the thermostatic element. and has an operat~
ing arrn?i‘i, preferably integral therewith, with a
depending finger 58 which is positioned in the.
valve -groove 3d. The end' oi the operating shaftl
is squared to receive a handle 49 and a pointer 55
v2,110,884
2
I or lindicator 50, whichV may cooperate with 'a
of the control mechanism. This construction-
graduated'temperature plate mounted as indi
cated by the dotted line _in Fig. 3, 'or may be
balances the flow- to the nìixing chamber, and
thus controls vthe-inlet areas independently of
bent over to cooperate with indications on the
fluid _pressure differences or variations.- If the
front _member such as shown in Fig. 1.
pressure of the fluids is high, it may be advisable `
'I'he mixed fluid passes upwardly from the
valve chamber„th1jough the thermostatic coil,
to mount stationary deflectors around the rods
and out through the outlet chamber 5|, see Fig. 3,
. which as shown is separated from the'valve
f io
chamber by a‘partition> 52.
'
60. to deflect the water away from the conical
portions 6| .and ,thus eliminate side thrust of the l
inñowing iluids bn the valve mechanism.
~ While we have described speçiñc embodiments
It has been found that surge is produced where .of our invention, such changes in` the design, in_
pocketsfof hot and cold water are alternately the proportions, and in the arrangement of the
formed within the regulator. ‘and that the above parts may be made to suit particular or special
described construction prevents surge _by direct
requirements for thermostaticy regulators, with
ing most- of the incoming fluid into the mixing ' out departing from the spirit or the scope ofthe 15
chamber, andpermitting a small amount of the \ invention as defined in the appended claims.
hot and the cold fluid to enterthe upper cham
ber. It has also been -determined that better
1. In a thermostatic regulator, a mixing cham
_regulation-is obtained if the inlet opening for
the cold water is slightly larger than the inlet
opening for the hot water; although the reason
for this is not‘clear, the experimental informa
ybei', `inlets for conducting hot and cold fluid to«
said mixing chamber. reciprocatable valve mech
- tion obtained has indicated that- the combination
thermostatic element ñxed at one end to saidcontrol shaft, vand having an element at the other
of three inletI pcr'ts for the cold water and two
25 inlet ports for the hot fluid is satisfactory.
The valve mechanism described is balanced, as J.
the fluid inlets- dirèct the flow across the valves.
The valve is not _therefore añected by variations
-or relative differences intheI pressures of the hot
and the cold fluids, as the entering streams are s
anismI controlling flow from said inlets to said
mixing chamber, a rotatable control shaft, a
end operatively con i ected to saidvalvev mecha
nism,`and a thrust
aring engaging saidvcontrol
shaft to limit movement of said control shaft and
its associated mechanism towards said valvemechanism. .
y
2. In a thermostatic regulator, a mixing cham-l
in substantially parallel planes. Observation has
ber, inlets for conducting hot .and cold fluid to .
disclosed that the hot and cold streams diverge
said mixing chamber, valve mechanism control
ling flow from said inlets to said mixing chamber,
towards the sides,'as 'the flow begins, and then
become radial with respect to .the inlet cylinder
35 as the flow increases.
Preferably, the ports are
positioned so that the outñowing ñuids do not
a rotatable control shaft,~ a thermostatic element '
ñxed at one end to lsaid control shaft, and having ,
an element rotatably mounted on said control
directly `contact the thermostatic- element whichE‘ shaft and at the other end operatively engaging
is mounted in the front member. The lconical
form- of the valve ends has been found to facili
-40 tate the mixing of the hot and coldflnids.
,
said valve mechanism, and a thrust -bearing en
gaging said control shaft to limit movement of
said control' shaft and its sociated mechanism
«Referring to Figs. 3 and ¿4, vthe operation of. towards said valve mecha m.
the novel: small flow thermostatic regulator mayk
3. In a thermostatic regulator, a b_ack member
. nowjbe explained: g
having iiuid inlets for hot and cold fluid and valve
mechanism for controlling flow -of said fluids,
45 the pointer or indicator opposite the desired tem
and a front member having a control> shaft,-a
perature indication; at this setting the thermo __thermostatic element secured at one end to said
static coil assumes a position suchv that it would shaft, and having an operating element at the
be without strain, if the >temperature of the other end ofsaid thermostatic element rotatably
The `-handle-is ñrst manually turned to bring
mixed fluid ñcorresponded to the temperature
mountedl on said control shaft and operatively
indication.
connected to said valve mechanism, and a thrust
'I‘he hot and cold water streams en
tering the inlet cylinder pass radially through v>bearing in said back member for the end ofisaid
the inlet ports, and- mixto pass'between the
thermostatic coils to the outlet chamber. As will
4. In a thermostatic regulator, a back mem
be noted from Fig. 3, the available ñow space is _ber having fluid inlets for.hot and cold fluid and
restricted to a minimum, thus forcing, the mixed valve ~mechanism for controlling' ñow, of said
control shaft.
A >fluid to pass through the vthermostatic coil con
..volutions `and ,tg-)_ `the outlet chamber, without
local eddies or disturbances'._
.
-
-
\
-fluids, Vand a front member having' a control shaft, a thermostatic element secured at one end to said
shaft, and having Aan operating element at- the
other end of said thermostatic element rotatably
from the set temperature dueto change in tem-l mounted on said control shaft and .operatively
perature of the hot, or‘cold fluid', the thermo-- engaging said valve ‘(mechanism, and a thrust
If the temperature of the" mixture changes
static coil expands or contracts to shift _the valve
bearing. in said backl member for the end of said
and thus vary the relative volume of hot and cold control 'shaftf
'
' '
iiuid. The radial inlet;ports,lthe conical form'>
5.- In a mixingvalve, a mixing chamber, an'out
65 of the valve ends, the mixing, and the'limited let chamberl adjacent thereto and 'separated
flow space, result in anl instant response to tem-4 therefrom by a partition, a thermostatic cham
perature changes) without surging.
ber freely' communicating with the mixing '_and
' If desired, a' balanced yvalve construction such
outlet chambers, means comprising a 'tubular
conduit device having a central partition and
70 the inlet chambers 53, 54 have lateral ports 55,. lports on each side of said partition for conducting
56, controlled by a slide valve 5l which has two a hot and a cold fluid into said mixing chamber,
as shown in-Fig. 9 may be used. In this form,
cylindrical valve sections 58, 59, the sections be
valve mechanism for controlling the relative
ifm secured by spiders to central rods 6I! which ` quantities of said fluids, and thermostatic means '
` end- in inner`conical portions 6| witha central‘ in said thermostatic chamber operatively control
groove 62 adapted to receive the operating ringer.
ling said valve mechanism.
'
andan
6. In a mixingvalve. a mixing chamber. an
outlet chamber, a. thermostatic chamber freely
communicating with the mixing and outlet
chambers, means comprising a. tubular conduit
device having a central partition and ports on
each side of said partition for conducting a hot
and a cold ñuid into said mixing chamber, valve
mechanism slidably mounted on said tubular con
duit device for controlling the relative quantities
3
of said fluids. said valve mechanism comprising
conical deiiectoi'. elements positioned _adjacent
said p_orts and inclined to direct the hot and cold
iiuids from said ports »towardsœach other, and
thermostatic'means in said thermostatic chamber i; ,
operatively controlling' said valve mechanism.
FREDERICK c. LEONARD.
GERMAIN Ross.
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