US1071936A

US1071936A - Automatic vacuum-governor.

Info

Publication number: US1071936A
Application number: US74365513A
Authority: US
Inventors: Frank J Matchette
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-01-22
Filing date: 1913-01-22
Publication date: 1913-09-02
Anticipated expiration: 1930-09-02

Description

P. J. MATCHETTE.

AUTOMATIC VACUUM GOVERNOR.

APPLICATION FILED DE(J.1B, 190a. RENEWED JAN. 22, 1913.

1,071,936. Patented Sept. 2, 1913.

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FRANK J. MATCI'IIE'ITE, OF MILWAUKEE, WISCONSIN.

i 1 AUTOMATIC VACUUM-GOVERNOR.

Specification of Letters Patent.

. atcntcd Sept. 2,1913.

Application filed December 18, 1908, Serial No. 468,109. Renewed January 22, 1913. Serial No. 743,655.

To all whom it may concern:

Be it known that l, FuANr: J. h'livrcie n'r'rn, a citizen of the United States. residing at Milwaukee, in the county of h [ib atr kee and State of \Visconsin, have invented certain new and useful lnnnovements in Autonuitic Vacuum-(hrvernors, oi which the following is a specification, reference being bad to the accompanying drawing, forming a part thereof.

This invention relates to means for antomatically controlling the supply of a fluid pressure medium such as steam, to vacuum producing means such as a pump or aspirator, according to ariations in the vacuum within certain limits. Its main object is to simplify and improve the construction and operation of devices of this class.

It consists in the novel constructimi, arrangement and combination of parts as hereinafter partieuhirly described and as defined in the appended claims.

In the accompanying d 'awing like characters designate the same parts in both figures.

Figure 1 is an elevation and partial section on the line 1-1, Fig. 2 of apparatus embodying the invention; and Fig. 52 a vertical longitudinal section on the line 2-2, Fig. 1, of the main valve forming a part of the apparatus.

The main valve case 0 having inlet and outlet connections 7) and c for the fluid pres sure medium which is controlled by the governor and which operates acuum produeing nnans such as a pump or aspirator, has between said connections a port and a valve seat (Z. In line with the port and valve seat the case is formed on the upper side with an opening in which a removablecap 6 formed with a stuffing box is threaded. A valve 7 formed or provided with a stem r passing through and guided in the shifting box, is fitted to said seat and arranged to close against the pressure of the medium it controls toward the inlet 7).

On one side the valve case is provided. with a horizontal bracket or arm it having a vertical cylindrical opening adjacent to its outer end. In this opening is fitted and secured by a not i the tubular threaded stem of a cylinder or vacuum chamber 7c. This cylinder or chamber is open at its upper end and provided with a removable head or cover Z having a central flanged opening and an air inlet and outlet at.

This inlet and outlet consists of? one or more openings 4) in the head or cover, surrounded by a rim or flange projecting upwardlyJtrom the cover and protected by a screen 7) and a removable cap (1 which prevent the admission of dust and dirt with air into the cylinder or chamber. A. piston r provided with suitable parking, is fitted in the cylinder or chamber K and has a stem or rod 8 extending upwardly through .and guided in the flanged opening of the head or cover 7,, and preferably also down- I wardly into the tubular stem A lever It pivoted at one end to the upper end of v the piston rod 3 and pivotally connected at 1 the other end by a link a with the valve case a, engages with the upper end of the i valve stem To insure the opening of the main valve in case the pressure of the medium it controls is insufficient, or the piston r sticks or binds in the cylinder or chamber in. a spring p which tends to force the piston upward, is inserted in the tubular neck around the lower end of the piston rod 8.

The cylinder or vacuum chamber Z: is connected below the piston '1- through the tubular stem 3/ by a pipe w with auxiliary valve mechanism whereby conunuuication is established between the lower end of said cylinder or chamber and a source of. vacuum or the atmosphere, accm'ding to variations within predcterminod limits of the vacuum produced by the medium under the control of the main 'alve For this purpose suitable automatic mechanism such as that shown in connection with the main valve and its motor in Fig. 1 may be employed. This mechanism comprises a casing 2, closed at the ends by caps 55 and piston valves -l and 5, which are pressed toward each other and the center of the casing 2 and normally held against a stop 6 by springs 7, the valves being hollow or recessed and open at their outer ends to receive the springs. The outer ends of the springs are seated against flanged followers 8 resting upon the points of adjusting screws 9 which are threaded in the caps 3.

The casing is Formed with a passage 10 comnlunicating with the enter recessed ends of the piston valves and connoited by a pipe 11 with a source of vacuum (not shown) which is controlled by the main valve f. It is also formed with a passage 12 which comnmnieates with the valve chamber through ports 13 and 14- and is connected by the pipe w with the cylinder or vacuum chamber of the main valve motor, and it has one or more ports 15 opening from the valve cham ber between the valves to the atmosphere.

The valve t is formed with an annularport 16, connected by radial passages with the spring chamber or recess and adapted to register when the valve is moved outward, with the port 13. The valve 5 is formed with an annular port 17 which registers, when the valve is in its inner position against the stop 6, with the port 14 and constantly communicates with the port or ports 15 through one or more longitudinal passages in the valve.

The apparatus hereinbefore described and constituting the governor, operates as follows: The several moving parts of the apparatus are shown in the positions they occupy when the fluid pressure medium is shut off from the vacuum producing means and there is no vacuum acting upon the auxiliary valve mechanism. Under these conditions, when the fluid pressure medium is admitted to the main valve f it will lift. said valve from its seat and pass through the case ain the direc tion indicated by arrows 011 Fig. 2, to the vacuum producing means, which will thereupon exhaust air through the pipe 11 and passage 10 from the casing 2 at the outer endsof the valves 4 and 5. When the pres-.

sure on the outer end of the valve 5 is reduced sufiiciently to enable the atmospheric pressure on the inner end of the valve to overcome the tension of the spring 7, said valve will be moved to the right and close the port 14;, thereby cutting off communication between the lower end of the cylinder 70 and the atmosphere, and when the pressure on the outer end of the valve 4 is reduced sufficiently. to enable the atmospheric pressure on the inner end of the valve to overcome the tension of the associated spring 7, said valve will .be moved to the left and carry the port 16 into register with the port 13, thereby establishing communication through the pipe w, passage 12, ports 13 and 16, passage 10 and pipe 11 with the source of vacuum. The air will thereupon be exhausted from the cylinder is below the piston r and said piston willbe drawn down against thetension of the spring '0 and close the main valve f against the pressure'of the medium which operates the vacuum producin means. The valve f will remain closed and the vacuum producing means inoperative until the vacuum or pressure in, the easing 2 on the outer end of the valve 41; is reduced sufficiently to release said Valve and permit it to be moved back to the right by the spring 7 acting thereon. VVhen this occurs the port 18 is closed and communication between the source of vacuum and the motor cylinder /c is .cut off. further reduction or the vacuum or pressure in the casing2- at the outer ends of the valves il and 5, releases the valve 5, permitting it to be moved back to the left by the spring 7 act ing thereon. This brings the port 17 into register with the port l t and establishes communication between the lowerend of the motor cylinder 70 and the atmosphere, through the pipe w, passage 12, ports 14 and 17 and ports 15. Thereupon aid will be admitted to the cylinder 70 below the piston 1 and the atmospheric pressure on the upper side of the piston will be balanced. The pressure of the fluid medium controlled by the valve f, aided by the spring '71 will. lift said valve from its seat, and move the piston 1" upward in the cylinder 713. The pressure medium being thus admitted to the vacuum producing means, the vacuum will be restored thereby to the limit for which the auxiliary valve mechanism or the spring 7 acting upon the valve t is adjusted. These operations will be automatically repeated as above explained, and the vacuum producing means will be started and stopped at predetermined limits of the vacuum produced thereby, accordingto the adjustment of the springs? of the auxiliary valve mechanism. By the adjustment of the screws 9, the tension of the springs 7 may be varied so that the valve f will be opened and closed at different minimum and maximum pressure limits. Increasing the tension'of the spring 7 acting on the valve 5, raises the minimum limit of vacuum at which said valve willbe opened by the spring and release and permit the opening of the main valve f. Increasing the tension of the spring 7- acting on'the valve 4, raises the maximum limit of vacuum. at which said valve will be opened against the pressure of said spring and cause the main valve f to close. In all adjustments of the auxiliary valve mechanism however, the valve 5 should be set to close before the opening of the valve 4, and hence the valve 4t to close before the opening of the valve The auxiliary valveinechanism maybe connected directly withthe vacuum produc ing means or, with a reservoir, or any part of a system from which air is exhausted by such means. WVh'en the pressure of the mediumcontrolled by the main valve fis suflicient,,the spring 4) acting on the'motor piston i may be omitted. Various changes in the details of construction and arrangement of parts oi"- the apparatus'may be made without departing from the principle and scope of the ini' 'ention.

Iclaimfl 1. In an automatic vacuum governor the combination or a valve adapted .to control the flow o f a pressure medium and'to be opened by the direct pressure of such medium, a vacuum chamber having a movable part, a lever connected with said movable part and adapted'to close said valve'against the pressure of said medium when a certain degree of vacuum is produced in said chamber, and means adapted to automatically establish and close communication between said chamber and a source of vacuum according to variations in the degree of vacuum.

2. In an automatic vacuum governor the combination of a valve adapted to control the flow of a n'essure medium and to be opened by the pressure of said medium thereon, a vacmnu chamber having a movable part, a lever connected with said movable part and adapted to close said valve when a certain degree of vacuum is produced in said chamber, a spring acting on said movable part in opposition to the vacuum and tending to release the valve, and automatic means adapted to establish and close communicmtion between said chamber and a source of vacuum according to variations in the degree of the vacuum.

3. In an automatic vacuum governor the combination of a valve adapted to control the flow ot' a pressure medium, a vacuum chamber having a movable part connected with said valve and adapted to close the same when a certain degree of vacuum is produced in said chamber, and automatic means adapted to alternately close communication between said chamber and the atmosphere and open communication between said chamber and a source oil? vacuum and to close communication between said chamber and the source of vacuum and open communication between said chamber and the atmosphere according to variations in the degree of the vacuum.

4. In an automatic vacuum governor the combination of a valve case having a bracket on one side and a stuffing box, a valve seated in said "ase to open with the pressure of the medium which it controls and having a stem projecting through said stutling box, a vacuum chamber mounted on said bracket and having a movable part, a lever connected with said movable part and by a link with said case and adapted to engage with the valve stem and to close the valve against the pressure of the medium which it controls when a certain degree of vacuum is produced in said chamber, and automatic means adapted to open and close comu'nlnication between said chamber and a source of vacuum.

5. in an automatic vacuum governor the combination of a valve case provided with a bracket projecting therefrom and formed with an opening, a valve seated in said case to close against the pressure which it controls and having a stem projecting through one side of the case, a vacuum chamber formed with a tubular stem which is fitted and secured in the owning in said bracket, a piston fitted in said chamber, a lever pivotally connected with the valve case and with said piston and engaging with the stem of the valve, and auxiliary valve mechanism connected with said tubular stem and adapted to automatically establish communication between said chamber and a source of vacuum or the atmosphere according to variations in the degree of vacuum.

(5. In an automatic vacuum governor the combination of a valve case having a bracket extending thmicitrom and formed with a cylindrical opening, a valve seated in said case against the pressure oil? the medium which it controls, a vacuum chamber having a protected opening to the atmosphere and a cylindrical stem which is fitted and secured in the opening oii said bracket, a piston fitted in said chamber between said stem and the opening to the atmosphere and having a rod passing through the wall of the chamber opposite said tubular stem, a lever pivotally connected with the valve case and piston rod and engaging with the valve stem, and auxiliary valve mechanism connected with said tubular stem and adapted to automatically establish communication between said chamber and a source of vacuum or the atmosphere according to variations in the degree of vacumn.

In witness whereot I. hereto allix my signature in presence of two witnesses.

FRANK J. M'A'lClllG' TE.

\Vitnesses CHAS. L. Goss, Pnnor S. Kaurnan.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.