US1594959A - Constant-pressure regulator - Google Patents

Description

Aug- 3 L. R UFF CONSTANT PRESSURE REGULATOR Filed NOV. 23, 1925 EVQ" k a RN 1 \i a: M q

m e: '3 J 21 B if 3 recess R Patented Aug. 3, 19 26.

UNITED stares PATENT orrics.

LESLIE R. HUFF, 0F PHILLIPSBUR-G, NEW JERSEY, ASSIGNOR TO IN GERSOLL-RAND COMPANY, OF JERSEY CITYfNEW' JERSEY, A CORPORATION OF NEW JERSEY.

CONSTANT-PRESSURE REGULATOR.

Application filed November 23, 1925. Serial No. 70,878.

This invention relates to pressure regulators, but more particularly to a constant pressure regulator for a motor driven turbo compressor in which discharge pressure from the compressor is utilized for regulating the delivery of power to the mo-tor.,

The objects of the invention are to maintain constant discharge pressure from the turbo compressor and to prevent over speeding of the motor.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combinations of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter i described and more particularly pointed out in the appended claims and illustrated in the accompanying drawing.

he figure in the drawing is an elevation in section of a constant pressure regulator applied to a turbo compressor.

Referring to the drawing, a turbo compressor A viewed from the steam end is provided with a discharge pipe B and is mounted on a foundation C. A steam pipe D leading from a source. of supply is adapted to convey steam to the motor of'the turbo compressor and has a valve chest E provided with a reciprocatory valve F for regulatingthe admission of steam to the motor of the compressor.

A cover G is mounted on a base H to form a chamber J. The cover G may be secured to the base H in any suitable manner, and ms formed integrally therewith at its top a cylinder K in which is adapted to reciprocate a regulator piston L, against a face 0 of which may act pressure fluid, such as oil, admitted into a chamber P by a control valve The upper or outer end of the cylinder K is preferably recessed as at R to receive any oil which may leak past the piston L, and a passage S leading from the to a drain passage T formed in the cover G and the base H provides a path for such leakage oil. V

In order to adjust the control valve Q so that a suitable pressure may be maintained within the chamber P at all times to tend to force the piston L outwardly, a compression spring U is arranged to act against the upper end of the valve Q and bears at its upper end against an adjusting spindle V. The adjusting spindle V is preferably in the form of a screw and has a hand wheel W for manipulating the spindle V to adjust the tension of the spring U for different d scharge pressures through the discharge pipe B. i

In this instance fluid under pressure, as for instance oil, is conveyed from a suitable source of supply through a pipe X into an annular groove Y formed in the valve casing Z. The annular groove Y encircles the sleeve 7) which is adapted to receive the valve Q and is provided wit-h a plurality of ports 0 in constant communication with the groove Y. The valve Q is preferably provided with a hollow bore (Z which extends partly throughout its length and is adapted to communicate with the ports 0 inthe sleeve Z) through a plurality of radial ports e.

To provide for the escape ofoil in case of excessive pressure against the valve Q, a

series of ports 7 are formed in the sleeve 6 above the ports a to register with an annular groove 9 formed in the valve casing Z. A pipe 72 connected at one end to communicate with the groove 9 and at its other end with the drain passage T provides a convenient means for carrying off the oil by-passed through the valve Q.

Mounted on the valve casing E is a bracket j which supports a cylinder is. A piston 0 is arranged to reciprocate within the cylinder is and is provided at its upper end witha rod 29 slidable through a-Vguide q and secured pivotally at its outer end with a balancing lever 1", which lever is pivoted at its other end to a governor lever s mounted pivotally on a link If. A piston red at in this instance forms a connection between the valve F and the piston 0.

Formed integrally with the cylinder is is a valve chest 1) provided with a ported sleeve 20 which serves as a guide for a pilot valve 00. The pilot valve 00 is provided in this instance with heads g and z and extends outwardly through the valve chest to connect pivotally with the balancing lever 7*, preferably intermediate the ends of said balancing lever as at 2. A

.3 and 4 in this instance lead fro-m the top and bot-tom ends of the cylinder is to the sleeve w and are controlled by the heads a and g respectively "of the valve w. Formed in the sleeve 20 between the passages 3 and 4 is a port 5 which afiords communication bepair of passages tween the interior of the sleeve 10 and a chamber 6 having a connection 7 through wnich pressure fluid, such as oil, may be admitted into said chamber from a source of supply.

In order that any oil which may be ad'- mitted into the ends of the cylinder 70 may be readily exhausted therefrom to the drain passage T, a port 8 is formed in the sleeve 10 above the passage 3. The port 8 communicates with a passage 9 leaning to a port 10 which registers with a port 12 opening into the drain passage T.

Inaccordance with the present invention, a head 13 supported by the cover G carries a corrugated collapsible diaphragm or sylphon 1a. The sylphon 1 1 in this instance is provided at its lower end with a movable head 15to which are secured on opposite sides rods or bolts 16. The bolts 16 extend upwardly into a chamber 17 and are secured to a yoke 18 extending transversely through the chamber 17. Intermediate the bolts 16, a rod 19 is secured at one end to the yoke 18 and extends upwardly through a sleeve 20 supported by the cover G and through the regulator piston L to connect pivotally with an arm 21 pivoted on a bracket 22 and extending beyond the bracket to connect with thelink t; The rod 19 is preferably secured fixedly to the piston L as by means of a nut 23. The bore of the sleeve 20 is preferably of sufficient. diameter so that contact between it and the rod 19 will be prevented. The sleeve 20 serves to prevent leakage of oil into the chamber 17 and also to prevent excessive leakage of oil into the interior or.

the piston L. I

In the present instance a speed governor 24 adapted tobe connected to the motor is operatively connected to one end of the gov ernor lever s. A pipe 25 connected at one end to the discharge pipe B is connected at the head 13 for conveyits other end with ing discharge pressure fluid from the pipe B to the interior ot the sylphon 1 1. In order to prevent lateral movement of the free end of the sylphon 1 1, a pin 26 is secured to the head 15 and extends slidably into a bore 27 in the bottom of the base II whereby said pin is guided.

If desired, a recess 28 may be formed in the top of the piston 0 to receive a spring 29which will tend to constantly force the piston 0 downwardly. In this way the pressure of the oil admitted into the top of the cylinder K will be augmented for closing the valve F.

The operation of the device is as follows: Assuming that the compressor is running at normal speed, and that pressure fluid is therefore being exhausted through the dis charge pipe B, a portion of the pressure fluidwill' flow through the pipe 25 into the sylphon 1 1 and acting against the head 15 will tend to move said head downwardly to wards the bottom of the base H. With the turbo compressor A running at normal speed, the pressure of the oil entering the chamber P will. also have attained its maximum pressure and acting against the bottom of the piston. L will tend to force the piston up man and thus tend to counterbalance the torce of the pressure fluid acting against the head 15 of the sylphon 1 1-. During the time that the forces acting against the head 15 of the sylph'on and against the piston L are equal, the valve Q will remain approximately in the position indi ated in the drawing, that is, the port c will be in registration with the ports 6 so that the piston Ii will be exposed directly to the 'f'ullline pressure of the oil. It in case the pressure acting against the head 15 ot the sylphon is suliiciently great to overcomethe pressure acting againstthe face 0 of the piston L, said piston will be moved downwardly displacing some of the oil in the chamber I. The oil thus displaced will force the valve Q upwardly until the ports 6 register with the ports and a portion oi the oil will pass into the drain passage '1 through the pipe h.

As the discharge pressure in the pipe B increases, the increased pressure acting against the head 15 will force said head downwardly together with the bolts and ods connecting said head with the lever 21. The lever 21 will then be rocked about its pivot and will in consequence rock the governor lever s and the balancing leverw to raisethe pilot valve x. As the pilot valve 00 is raised, the passage 3 will be placed in communication with the chamber 6 and oil will flow from said chamber to the top of the cylinder 76. The oil thus admitted will act against the piston 0 and force said piston downwardly, and valve 00. In this way the steam flow to the motor of the turbo compressor A will'be reduced, as well as the discharge pressure from the compressor. With the decreased discharge pressure in the pipe B and therefore in the sylphon 14, the pressure acting against thepiston L may then be greater than the discharge pressure from the compressor and will force said piston upwardly. Such movement of the piston L will move the pilot valve downwardly in the sleeve w and establish communication between the chamber 6 and the passage 4. With the pilot valve 00 in this position, oil will flow from the chamber 6 beneath the piston 0 and again'open the valve F. Movement of the pilot valve 00 towards either of its open positions whereby oil will be admitted into one end of the cylinder is will also establish communication between-the opposite end of said cylinder and the passages leading to the drain passage T, so

thus tending to close the V of said cylinder by the pressure face of the pisthat any oil in either end may be forced therefrom acting against the opposite ton 0.

Overspeeding of the motor which drives the compressor is at all times prevented by the governor 24 which, being connected to operate the valve 00, will at certain speeds of the motor rock the lever s and the balancing lever r to open the pilot valve w, and thus admit oil under pressure into the cylinder is as hereinbefore described. The governor 24: also controls the admission of steam to the motor when said motor is first being started and before sufficient discharge pres sure is built up to set the sylphon 14 in operation.

I claim:

1. A pressure regulator for motor driven turbo-compressors, comprising a frame, a corrugated collapsible diaphragm connected at one end to the frame and having a movable head at the other end, guiding means for said movable head, bolts secured to the movable head, a yoke connecting said bolts, an operating rod extending from said yoke and adapted to be connected to regulating mechanism, and a pressure fluid connection between the discharge of the turbo-compressor and the diaphragm, whereby the diaphragm is subject to discharge pressure for regulating purposes.

2. A pressure regulator for motor driven turbo-compressors and the like, comprising a base having a chamber therein, a cover for the base, a head supported inside the cover, a corrugated collapsible diaphragm connected at one end to the cover, a movable head at the other end, of the diaphragm, a guide pin on said head guided in the base, bolts secured at opposite sides to said movable head, a yoke connecting the rods within the cover, a rod extending from the yoke and adapted to be operatively connected to regulating mechanism, and a pipe connection between the discharge of the turbo-compressor and the inside of the collapsible diaphragm, whereby the diaphragm is subject to discharge pressure for regulating purposes.

In testimony whereof I have signed this specification.

LESLIE R. HUFF.

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