US1732174A

US1732174A - Heat-regulating device

Info

Publication number: US1732174A
Application number: US278237A
Authority: US
Inventors: Harold W Sweatt
Original assignee: Minneapolis Honeywell Regulator Co
Current assignee: Honeywell Inc
Priority date: 1928-05-16
Filing date: 1928-05-16
Publication date: 1929-10-15
Anticipated expiration: 1946-10-15

Description

Oct. 15, 1929 w, -r 1332;174-

HEAT REGULATING DEVICE Filed May 16, 1928 I INVENTOR HAROLD W. SWEAT? A Tromvzys details of construction and arrangement, 0

Patented Oct. '15, 1929 I UNITED STATES PATENT OFFICE HAROLD .w. swii'ar'r, or innnmoms; nimmso'ra ASSIGNOB r0 'umnnuoms HONEYWELL REGULATOR 001mm, or urmm'aroms, mnumsorra, A coarona- TION OF DELAWARE Application filed lay 16 This invention relates generally to improvements in apparatus for automatically controlling heat producing devices, and is particularly directed to a method and/or construction which will cause a burning of any fuel delivered to a burner apparatus after the fuel supply is cut off or discontinued. By the use of the-method and/or device herein, carbon deposit resulting in smoky flame is avoided, due to the delivery of repeated small quantities of oil, for example after each normal shut-down of the apparatus, as when a control device in a room causes a shut-down due to a sufiiciently warm room. By consuming all the residual oil in the above manner cracking of the oil (and carbon deposit therefrom) is also avoided.

Other objects are to provide means comprising an electro-magnetically operable device or its equivalent, controlling contacts in such manner that when closed the burner apparatus is started and fuel is delivered; to provide. means controlled by the presence of flame or heat delivered'by the burner apparatus; to maintain operation of the burner apparatus until any residual oil is burned;

to combine with the above means an ignition timing device which will control a preliminary ignition' period at the end of which if flame is not produced the fuel supply will be dis'continued,'as well as the operation of the burner per se, so that thereafter a normal restart of the apparatus cannot be made until after a manual resetting 'of the timing device to close the switch controlled thereby.

Featuresof the invention include the broad idea of providing a device which will cause a continued operation of the burner apparatus to burn residual oil after each shutdown; to the method as well as the general the device herein; and to the general arrangement and details of construction of means auztiliary to the above mentioned means, including a timing control device. a

Features'and advantages of the invention will be set forth in the description of the drawings forming a part of this-application, and in said drawings nmm-nneumrmo Davies 1928. Serial no; 278,23").

Figure 1 is a diagrammatic view showing a very simple application of the invention; and

Figure 2 is a diagrammatic view carrying forward the idea shown inFigure 1 in combination witha timing device, with the whole apparatus under the control of a device such as a room thermostat.

A simple embodiment of the invention is shown in Figure 1, in which the numeral 1 designates one power line and numeral 2 the other power line. The fuel burning apparatus is generally indicated at 3, as a motor, but it will be understood that this apparatus includes all the elements necessary for the production of flame and includes a fuel control element, herein an electro-magnetic device, designated 4. The numeral 5 designates a. thermally operable device, as a switch,

which is arranged to be affected by temperature changes in orat the burner apparatus, and to close only when the burner apparatus is operating. to produce flame. The contact for this device is indicated at 6. One side of the fuel control device is connected by conductor 7 with the line 2 and the opposite side is connected to contact 8 by conductor 9. One side of the motor or control (for example draft control) part of the fuel apparatus is connected on one side by conductor 10 with line 2 and on the opposite side by conductor 11 with contact 12. Contacts 8 and 12 are controlled, in this instance, by a double switch f connectedby conductor 18 with line, 1, and

the contact fi ofthis device is connected by conductor 19 with the opposite side of the motorbr fuel apparatus.

Operation-( device of Figure 1) Suppose the-switches 13 and 14 to be closed. The fuel apparatus will operate and the coil 4 of the fuel control device will be energized to supply fuel. On the production of flame, the element 5will make contact at 6., Then suppose the switches 1314 to be opened (for example because of rise in room temperature). It will beseen that although the motor control contact 12 is. now open, the motor continues to run (because presence of flame has closed the switch 5) but that the fuel supply is cut off because of de-energization of the coil 4:. The motor or burner apparatus 3 will continueto operate until the oil which has beensupplied to it has been completely burned. lVhen this oil has been burned, there will be no flame, and the element 5 will cool, opening contact 6 to stop the motor. 011' reclosing vcontacts 8 and 12 to again obtain flame or ignition (as after a normal shut-down of the apparatus) .there will be no residual oil but only that supplied after the restart. The device, therefore, provides a burner apparatus and a circuit along with fuel su ply and fuel and motor control means for-t eapparatus, and also a switch ing apparatus and/or motor, and operable as the result of temperature changes in the burner apparatus and/or motor to close only when the burner apparatus is operating to produce flame, to open only when no flame is present.

The embodiment of the invention shown in Figure 2, includes certain other features, some of which are shown in my co-pending application for heat regulating devices, Se-

rial Number 233,888, filed November 17, 1927. Although there is no intention to be limited to the details of the device or devices now to be described, the details of connections and arrangement and useof the elements are all The coil of the magnetically operab considered features of this invention.

The main lines are respectively indicated 2526. The burner apparatus motor or equivalent device is indicated at 27. Some sort of ignition means is assumed, which is operative at least whenever fuel is supplied.

e fuel control means or equivalent device is indicated at 28. It is assumed that the fuel controlled by the coil 28 is delivered to a fire pot or burner the draft to which is controlled by the motor, or equivalentdevice, which can be electrically controlled. The coil of a relay is indicated at 29 and the coil of another relay is indicated at 30. 'The coil of a pilot relay is indicated at 31, The armature of relay 29 is indicated at 32, the armature of relay 30 is indicated at 33 and the armature of relay 31 is indicated at 34. The armature34c, for the purpose herein, may be considered a current carrying element. The relay 29 controls, in this instance, three switch elements, respectively designated at35, 36 and 37, respectively cooperating with

contacts

38, 39 and 40, re-

spectively controlling the holding contact for. the coil 31, energization of the coil 28, and a arranged to separately control only the heat-' similar control for the motor 27. The armature 33 also controls-three switch elements respectively designated 41, 42 and 43, respectively cooperatingwith

vcontacts

45, 46 and 47, respectively an auxiliary contact forcontrolling energization of the motor 27 ,a starting contact for the coil 31, and a control for the shunt circuit of the heating coil 50, The coil .50 is a heating coil of a thermally operable timing device, and this timing device has a thermally operable (for example bi metallic) switch controlling element indicated at 51. This element when cold assumes the position shown in the figure and holds the intermediately pivoted switch arm 52 in a position to close the circuit against contact 53. The movable element of a thermally operable switch is indicated at R, and this element cooperates with contacts BW, in this instance by sequentially engaging the contacts. This device may be a'rranged to be affected by temperatures in a room, and to close its contact .when the room is sufficiently cold, or when it is desired to operate the heating apparatus to supply heat. In this instance, a secondary circuit is used to energize the coil 31, which controls, through switch 34, energ'ization of coil 29 and therefore the motor and fuel supply. The primary coil 60 of a transformer is connected respectively with side of the secondary 61-is connected by conductor 64 with one end of the coil 31, and the opposite end of the coil 31 is connected by conductor 65, and

branch conductors

66, 67 with switches 35-412, which respectively control holding and starting contacts of the secondary circuit. In this instance, the coil 30 is connected on one side by conductor 70 with line 25 and on the other side by conductor 71 with a thermally operable device 72 cooperating. with a contact 73 in turn connected by conductor 7 4 with line 26. It will be understood that the thermall operable device is placed to be effected by ame produced at the burner apparatus 27, and is adapted to close on the presence of flame and open in the ab-' sence of flame. It will, therefore, be seen that when flame is present a closure will take place and relay coil 30 will be energized to close armature 33 and contacts 45,- 47, at the same time opening the starting contact 46.

Elements

43 and 47 control a shunt circuit to the element 50, and when these elements are closing their contacts the element 50 .is inoperative. The shunt circuit for the coil 50 includes contact 47, connected by conductor 7 5 with one terminal of the coil 50, and the switch element 43, connected by conductor 7 6 with the other terminal of the coil 50. This same terminal of the coil is connected by conductor 77 with one terminal of the coil 29 and the opposite terminal of coil 29 is connected by'conductor 78 with switch arm 3& operating against contact 79, in turn connected by,

a conductor 80 with line 25. The opposite side of the coil 50 is'connected by conductor 81 with line 26. It will be thus noted that the

coils

50 and 29, are in series, and their energization is controlled by switch 34 in turn controlled through coil. 31 as the result of opening and closing movements of element R. i The element R is connected by conductor 82 with the holding contact 38. It will, therefore, be seen that when R closes its contacts, coil 31 will be energized, switch 34 will close, and coil 29 will be energized, closing

contacts

36, 39, 37, 40 controlled thereby and starting the burn-ing apparatus, and supplying fuel. The circuits are traced herebelow.

The fuel control device 28 is connected by i conductor 85 with line on one side, and on the other side by conductor 86 withelement 36. Contact 39 is connected by conductor 87 with conductor 89 which connects at one end with one side of the burner apparatus or motor and at the other end with auxiliary motor control contact 45. Element 41 cooperative with contact is connected by conductor 90 with line 26, and a branch conductor 91 connects line. 90 with the element 37 operating against the motor control contact 40, which'is connected by conductor 92 with conductor89. The opposite side of the burner apparatus is connected by conductor 93 with line 25. I

Operation (device of F igure 2) Suppose 'a normal operation, that one wherein the room thermostat closes at R on a call ,for heat, and wherein ignition issuccessful before the element 51 can move sufiiciently to open the switch 52, and in which there is no residual oil in. for example, the burner pot. A closure of R with contacts B WV causes energization of coil 31 through the following circuit: 61, 64, 31, 65, 66, 46, 42, B, W, 96, 52, 53, 95 to 61. The armature 34 now closes with contact 79, and coils 29 and are simultaneously energized through the following circuit: 25, 80; 79, 34, 78, 29, 77, 50, 81. to 26. On energization, three contacts are closed, holding contacts 3538, fuel supply contacts 3639 and burner motor contacts 37-40. It is, of course, assumed that the burner apparatus includes ignition means, and at this stage the burner apparatus and/or motor is operating and fuel is being supplied. At the same time, the holding contact is closed'so that when the starting contact is broken at 4246, coil 29 will remain energized, if R remains closed. As before stated, we areassuming a normal operation. Therefore, ignition has been successful and flame is forthcoming. The immediateresult of supply of flame is the closure of 7273 and energization of coil 30. In view of the simple circuit in this case, it js not .deemed necessary to trace it. A closure of 33 closes shunt circuit contacts-4347', and auxiliary motor control contacts 4145, and opens control circuit starting contacts 4246. As" a result, the coil 50 is shunted so that'it does not receive sufficient current to cause it to operate, and therefore to cause it to eventually obtain an opening of the contacts 52-53 to de-energize the coil 29 and discontinue the fuel supply. Since by energization of 30, the startingcontacts 4246 are opened, a normal start cannot again be-made until this contact is closed, as the result of absence of flame and therefore de-energization of the coil 30'.

It will be noted that when both coils 29 and 30 are energized, both motor contacts, respectively- 3639 and 4145 are closed. Thus the apparatus is conditioned, (in case contacts 364-39, 374O should be open for any reason) to continue operation of the burner motor until all residual oil has been burned, after which, because of the absence of flame, 72-'7 3. willbe opened, and coil 30 will be de-energized breaking the auxiliary contacts 4145 to then, and only then, stop burner operation.

Continuing with the description of the nor-' mal operation, and assuming that the apparatus is furnishing flame. After a "certain time a room in which the thermostat R is placed, will become sufiiciently warm. The element R will then assume the position shown in the drawing, resulting in deenergization of the coil 31 openingof contacts '34-79. and de-energization of'coil 29 and therefore opening of the contacts 3639 37-4O to out off 'the fuel supply,(because o the opening of the contacts 3740). However, in'view of the fact that there is flame and that coil 30 is energized and that, 'there.-' fore, contacts 4145 are closed, the opening of contacts 36-39 will not cause a shut down of the motor, but the operation will continue until whatever residual'oil remains is burned. After this has taken place, (because of the absence of flame) contacts 72-7 3 will open, coil 30 will be de-energized, and contacts 4145 will open, shutting down the apparatus, with no residual oil left in the pot.

A feature of the invention which is included with the means for burning residual oil after the fuel supply is cut off, includes the thermally operable timing switch including the elements 5051--52 and 53, along with the shunt

circuit including elements

75, 47, 43, and 76, as well as

elements

81, 77, 29, 78, 34, 79 and 80. It must beagain noted that the elements 5029 are in series in this circuit, and that, therefore, both are simulopening switch 34, and, therefore, releasing.

apparatus started and fuel furnished, and

that ignition is successful, closing the contacts 7 2-73. Suppose that heat is furnished over a suflicient period of time to cause R to open and then suppose that the cont-acts 7273 are fused together, and that there is flame failure. Ordinarily 7 27 3 would open to de-energize and allow holding contacts 4246 to make so that a restart could be had. However, under the abnormal condition im- I agined, this will not take place and therefore '42 and 416 remain open. Then suppose R to make at W-B. It will be seen that the magnet 31 cannot be closed because tracing the

circuit

61, 64, 31, 65, 66 to contact 46, the current cannot pass because42 is not making. Therefore, a restart cannot be made until the fused contacts are separated, or until repair is made. i v 30 I claim:

1. A burner apparatus including a fuel control device, a switch for controlling said burner apparatus and fuel control device, a second switch for independently controlling the burner apparatus, and operable to close when flame is obtained, and to open on discontinuance of flame.

2. A burner apparatus including a fuel supply device, a switch for controlling said burner apparatus and fuel control device, a second switch thermally operable for independently controlling the burner apparatus and operable to close when the apparatus is producing heat.

3. An electricallyoperable burner apparatus including an electrically operable fuel supply device, a switch for substantially simultaneously controlling both, a second switch thermally operable for independently controlling the burner apparatus, and operable to close when flame is obtained at the gurner, and to open on discontinuance of ame.

4. A burner apparatus and fuel control means therefor, a switch adapted to close only when the burner is producing heat, a second switch adapted when closed to cause operation of the apparatus and fuel control means to produce flame, and circuit connections such that ,the circuit to the burner apparatus is maintained bythe first mentioned switch after opening of the last switch, until all fuel is consumed.

5. A burner apparatus and circuit therefor,

6 fuel control means for said apparatus, a

switch arranged to separately control only the heating apparatus and operable as the result of temperature changes at the burner apparatus to close only when said burner apparatus is operating to produce flame, a second-switch, and circuit connectionssuch that on closure fuel is supplied to the burner apparatus and said apparatus is started, the arrangement being such that on the production of flame said first mentioned switch closes and when the last mentioned switch is opened to interrupt fuel supply,said first mentioned switch remains closed and continues operation of the apparatus, as a result offlame produced by fuel delivered after interruption of the fuel supply.

6. A burner apparatus including a fuel control device, a first .switch for controlling said burner apparatus and fuel control de vice, a second switch operable for independently controlling the burner and adapted to close when flame is obtained and to open on discontinuance of flame, a relay for controlling the first switch, a second relay controlled by the second switch, a timing device including a switch and having a heating coil in circuit with the coil of the first relay, a shunt circuit for the heating coil controlled by the second relay, said second relay having a contact for controlling the burner apparatus, and'means'in circuit with the switch of the timing device for obtaining energizatlon of the first relay.

7'. A burner apparatus including a fuel control device, a first switch for controlling said burner apparatus and fuel control devlce, a

' second switch operable for independently controlling the burner and adapted to close when flame is obtained and to open on discontinuance of flame, a relay for controlling the first-switch, a second relay controlled by the second switch, a timing device including a switch and having a heating coil in circuit with the coilof the first relay, and a shunt circuit for the heating coil controlled by the second relay, said second relay having a contact for controlling the burner apparatus, means in circuit with the switch ofthe timing device for obtaining energization of thefirst relay, and starting and'holding contacts for the last mentioned means respectively controlled by the second and first relays.

8. A burner apparatus including a fuel control device, a first switch for controlling said burner apparatus and fuel control device, a 12 second switch operable for independently controlling the burner and adapted to close when flame is obtained and to open on discontinuance .of flame, a relay for controlling the first switch, a second relay controlled by the sec-- 0nd switch, a timing device including a switch and having a heating coil in circuit with the coil of the first relay, and a shunt circuit for the heating 'coil'controlled by the second relay,

trolling the burner apparatus, means in circuit with the switch of the timing device for obtaining energization of the first relay, and starting and holding contacts for the last mentioned means respectively controlled by the second and first relays, the starting contact to close when the second relay opens, and a holding contact to close when the first relay closes.

9. A burner apparatus including a fuel control device, a first switch for controlling said burner apparatus and said fuel control device simultaneously, a second switch operable for independently controlling the burner and adapted to close when flame is obtained and to open on discontinuance of flame, a relay for controlling the first switch, a second relay controlled by the second switch, a timing device including a switch and having 'a heating coil in circuit with the coil of the first relay, and a shunt circuit for the heating coil controlled by the second relay to close when the relay closes, said second relay having an auxiliary contact for independently controlling only the burner apparatus to close the motor circuit when the second relay closes, and means in circuit with the switch of the timing device for obtaining energization of the first relay.

10. A burner apparatus including a fuel control device, a first switch for controlling said burner apparatus and said fuel control device simultaneously, a second switch thermally operable for independently controlling the burner apparatus, and operable to close when flame is obtained and to open on dis-' continuance of flame, a relay for controlling the first switch, a second relay controlled by the thermally operable switch, a timing device including a switch and having a heating coil in circuit with the coil of the first relay, and a shunt circuit for the heating coil controlled by the second relay to close when the relay closes, said second relay having an auxiliary contact for controlling only'the motor, to close the motor circuit when the second relay closes, switch of the timing device, for obtaining energization ofthe first relay.

In witness whereof, I have hereunto set .my hand this 10th day of May, 1928.

HAROLD W. SWEATT.

and means in circuit with the