US688195A - Draft-regulator. - Google Patents

Description

No. 688,l95. Patented Dec. 3,1901.- J. H. PEA'RSUN.

DRAFT REGULATOR.

[Application led Apr. 16, 1901. (No Model.) 2 Sheets-Sheet I.

No. 688,|95. Patented Dec. 3, i901. J. H. PEARSON.

DRAFT REGULATOR.

(Applicatin filed Apr. 18, 1901.) (No Model.) 2 Sheets-Sheet 2.

G Hoz" mad TNS Nonms PETERS oo, mocruwo., WASHINGTON, r@4 r:`

NrTED STATES Prfrmwr OFFICE.

JAMES H. PEARSON, OF WORTHINGTON, INDIANA.

DRAFT-REG U LATO R.

SPECIFICATION forming part of Letters Patent 1\T o. 688,195, dated December 3, 1901. Application filed April 16,1901. Serial No. 56,124. (No model.)

construction for automatically regulating the' draft of steam-boiler furnaces, accelerating the draft when the fire is slow, and retarding the draft when the fire is too brisk and the pressure of steam in excess of a given point.

For a full description of the invention and the merits thereof and also to acquire aknowledge of the details of construction of the means for effecting the result reference is to be had to the following description and drawings hereto attached.

Vhile the essential and characteristic features of the invention are necessarily susceptible of modification, still the preferred embodiment of the invention is illustrated in the accompanying drawings, in which- Figure 1 is a detail view in elevation, showing the application of the invention. Fig. 2 is a sectional detail, on a larger scale, showing the normal position of the parts when the npdraft-valve is open, the arrows indicating the direction of the steam to increase the draft through the stack. Fig. 3 is a view similar to Fig. 2, the updraft-valve being closed. Fig. a is a view similar to Fig. 3, the main valve being open andl the arrows indicating the direction of the steam to retard the draft through the stack. Fig. 5 is a horizontal section on the line X X of Fig. 2. 6 is a perspective view of the divided outlo w pipe. Fig. 7 is a detail section of the divided elbow and outflow-pipe connected.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

In its general construction the device conprises a casing, cooperating valves, and tension-sprin gs. The casing consists of a pipe 1, an elbow 2, and a cup 3, the latter having a the cup 3 exterior to the valve-stem 9.

Fig. f

threaded end 4, by means of which it is connected to the steam-boiler 5, to which the regulator is applied. The pipe 1 has its delivery end iitted to the smoke-stack 6 of the steamboiler furnace and projected therein a suitable distance, so as either to accelerate or retard the draft as Vmay be required to maintain a predetermined pressure of steam within the boiler. The several parts l, 2, and 3 may be connected in any desired way, and, as shown, they are coupled by the usual screwthread joints. The vertical branch of the elbow 2 is fitted into the upper end of the cup 3, thereby providing a shoulder 7 for the upper end of the spring 8 to obtain a purchase against, said spring being mounted upon the stem 9 of the main valvelO and the lower end of the spring obtaining a bearing upon the outer portion of the valve 10 beyondV the sides ofthe stem 9. This spring 8 serves normally to hold the valve 10 seated against the boiler-pressure when not in excess of a given point,thereby preventing passage of the steam from the boiler by the valve 10 and through The valve 10 is of a diameter to fit snugly within the cup 3 and is formed in its edges with a series of grooves or channels 11, constituting passages for the outiiow of steam when the valve 10 is unseated. This valve closes downward against a seat 12, provided at the lower end of the cup 3, the tension of the spring 8 being regulated so as to prevent the unseating of said valve until the pressure of steam within the boiler exceeds a predetermined pressure.

The elbow 2 is subdivided, so as to providek chambers or passages 13 and 14, which are in communication with corresponding passages 13a and 1&1a of the pipe 1. A partition 15 separates the`passages 13 and 14,and its upper end extends above the lowermost wall ofthe horizontal branch of the elbow, so as to close the inner end of the passage 14;n of the pipe 1. The upper end of the valve-stem 9 snugly fits within the lower portion of the passage 13, so as to prevent the escape of steam from the cup 3 into the passage 13 when the valve l0 is unseated. l

The pipe 1 will be designated as the outflow-pipe and may be of any construction so IOC long as it comprises the passages 13 and 14, which are in communication with the corresponding passages 13 and 14 of the intermediate portion of the casing. As shown,the pipe 1 is subdivided by a partition 16, and its outer end is closed by a header 17, and theinner end of the passage 14a is :closed by a header 18, the inner end of the passage 13a being open. Openings 19 and 2O are provided at the outer end of the outflow-pipe and -communicate with, respectively, the passages 13a and 14a. An opening 2l is provided at the inner end of the pipe andis in communication with the passage 14. As hereinbefore stated, the outer end portion of the part l is adapted to be connected to the lower or base pol'tion of the stack 6 in any desired way, and the delivery end portion projects into said stack a suitable distance, so as to secure all the advantages of the invention with reference to accelerating and retarding the draft. When the parts 1 and 2 are assembled, the header 18 abuts against the upper end portion of the partition 15, so as to prevent any steam from the passage 14 escaping into the upper portion of the 'elbow and entering the passage 13% The main valve lO and its stem are hollow or bored lto receive a Valve 22 and its stem 23, constituting the updraft-valve. The upper portion of the stem 23 is hollow or bored,

as shown at 24, to receive acoil-spring 25, by

means of which the valve 22 is normally held unseated, so as to permit the free passage of steam thereby through the valve 10 and out through the passage 13 and up through the stack 6, so as to increase the draft after the manner of a blower and twyer. The valve 22 when closed is seated within the lower face of the valve l0 and is prevented from vertical displacement by means of a pin 26, supported lat its ends in transversely-ahmed openings of the stem 9 and passing through vertical slots 27 in diametrically opposite sides of the hollow portion of the valve-stem 23. The coil-spring 25 is confined in the opening 24 by means of the pin 26 and normally exerts a downward pressure upon the Valve 22 to hold it unseated. The spring 25 is of less tension than the spring 8, so as to yield and permit of the seating of the updraft-valve while the main valve remains seated. 1

When in position, the lower portion of the .casing is connected to the shell of the boiler 5 and is in communication with the steamspace thereof and its opposite end is connected to the smoke-stack. The valve 22 being open under normal conditions, the steam from the boiler passes thereby and through the main valve and into the stack by way of the passage 13a and the opening 19, and being directed upward into the stack creates a forced draft therethrough and through the furnace after the manner of a twyer, whereby the draft is greatly accelerated and the fire caused to burn briskly. The tension of the spring 25 may be set with reference to the area of the valve 22 so as to hold the latter open until the required steam-boiler pressure has been reached, when the said spring will be compressed and the valve 22 closed,thereby shutting off the j et of steam through the stack. When the steam in the boiler exceeds a predetermined pressure, it overcomes the tension of the spring 8 and unseats the valve 10, when a portion of the steam will pass by the valve 10 through the c'up 2, passages 14 14, and out through the opening 20 into the stack 6, and being directed downward into said stack retards the draft therethrough and dampens the tire by choking off the draft therethrough. When the steam falls to the required pressure, the spring 8, regaining itself, closes the valve 10 and shuts olf the reverse blast in the stack and permits the fire to burn under natural draft, and when the steam-pressure falls below the standard the spring 25 will unseat the valve 22 and again permit a forced updraft through the stack, whereby the lire is caused to burn more briskly and the steam generated more rapidly. When the steam-pressure is normal, the blast-creating device is inert, and when the pressure exceeds or falls below a given point a blast is created in the smoke-stack either in an upward or downward direction to accelerate or retard the draft to meet eX- isting conditions.

Having thus described the invention, what is claimed as new is- 1. In a draft-regulator for steam-boiler'and other furnaces a casing adapted to be connected with the stack and the steam-space of the boiler and having passages opening into said stack in an upward and a downward direction, and automatic valves for controlling the admission of steam into said passages, the valve which controls the passage opening upward in the stack being closed when a certain predetermined pressure in the boiler is reached, and the Valve which controls the passage opening downward in the stack being opened when there is an abnormal pressure in the boiler.

2. In a draft-regulator for steam-boiler and other furnaces, a casing adapted to be connected with the steam-space and the stack of the furnace, said casing having passages opening upward and downward into the said stack, coperating valves for controlling the said passages, and dierent-tensioned springs for holding the said valves in a normal position, the valve for controlling the downdraft being normally seated and the updraft-valve normally open, substantially as set forth.

3. In a draft-regulator, a casing having passagesopening in an upward and a downward direction, and spring-actuated valves for controlling the admission of steam into the said passages, the valve which controls the passage opening upward being mounted within the valve which controls the passage opening downward and normally unseated and adapted to be closed when a certain predetermined pressure in the boiler is reached, and the valve IOC) IIO

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which controls the passage opening downward being opened when there is an abnormal pressure in the boiler, substantially as set forth.

4. In a draft-regulator, a casing having passages opening in opposite directions, a main valve normally seated and adapted to control the passage of steam through the passage opening downward, and an updraftvalve mounted within the main valve and normally unseated to permit of the escape of steam through the upwardly-opening passage and adapted to close by an excessive pressure of steam, substantially as set forth.

5. In a draft-regulator, a casing comprising approximately rightangularly-disposed members, the upper portion of the vertical member and the horizontal member being partitioned to form corresponding intercom munieating passages which open upwardly and downwardly at theirdeliveryends,and springcontrolled concentric valves located in the vertical member of the casing for controlling the aforesaid passages, the valve which controls the passage opening upward being mounted within the valve which controls the passage opening downward and normally unseated and adapted to be closed when a certain predetermined pressure in the boiler is reached, and the valve which controls the passage opening downward being opened when there is an abnormal pressure in the boiler, substantially as set forth.

6. A draft-regulator comprising a casing having passages opening in opposite directions, a main valve normally held seated and adapted to control the passage of steam through the passage opening downward and having an opening therethrough, an updraftvalve mounted in the opening of the main valve for controlling the passage of steam therethrough to the passage opening upward and having an opening in its upper end, and opposite slots, a spring fitted into the opening of the updraft-valve, and a pin for conning said spring and preventing displacement of the updraft-valve by passing through the slots thereof and having its ends secured to the main valve, substantially as set forth.

7. A draft-regulator comprising a vertical member having its upper portion partitioned to form passages, a horizontal member having passages in communication with the respective passages of the vertical member and having upper and lower outlets, the upper portion of the partition of the vertical member overlapping the inner end of a passage of the horizon tal member, and concentric valves for controlling the passage of steam through the said passages, the valve which controls the passage opening upward being mounted within the valve which controls the passage opening downward and normally unseated and adapted to be closed when a certain predetermined pressure in the boileris reached,y and the valve which controls the passage opening downward being opened when there is an abnormal pressure in the boiler, substantially as set forth.

8. A draft-regulator comprising a cup, a partitioned outflow-pipe having upper and lower outlets, a partitioned elbow connecting the cup and outflow-pipe, a main valve 1ocated in the cup and adapted to control the passage of steam through the passage opening downward and having a tubular stem operating in the vertical branch of the elbow, a spring normally holding the main valve seated, an updrat't-valve slidingly mounted in the main valve and normally open, and adapted to control the passage of steam therethrough to the passage opening upward, a spring seated in the upper portion of the stem of the updraft-valve, and a pin for preventing displacement of the updraft-valve and confining the actuating-springthereof, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES H. PEARSON. s] Vitnesses:

J As. E. WARD, y CHARLES WHITE.

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