US1528405A

US1528405A - Constant elow motor

Info

Publication number: US1528405A
Authority: US
Publication date: 1925-03-03
Anticipated expiration: 1942-03-03

Description

Mar. 3, 1925. 1,528,405

w; CRAIG CONSTANT FLOW MOTOR Filed Oct. 6, 1922 a wwf/Wma' Patented Mar. 3, 1925.

PATENT OFFICE.

WILEY CRAIG, OF CINCINNATI. OHIO.

CONSTANT FLOW MOTOR.

Application led October 6, 1922. Serial No. 592,879.

To all whom 'it may concern:

Be it known that I, WILEY CRAIG, a citizen of the United States, and a resident of Cin'- cinnati, in the county of Hamilton and State of Ohio, have invented a certain new and useful Constant Flow Motor, of which the following isla lfull, clear, and exact description, reference being had to the accompanying drawings, forming part of this specificat-lOn.' 4

My invention relates to devices adapted to be used in connection With gauges or indicating devices of various characters for the transmission of an impressed movement by the g'auge or indicator to some other element, such as a valve, switch or damper.

Thus in combination with a` pressure gauge in a steam line, where a uniform pressure of steam is desired, the movable element of the pressure gauge is connected to my constant flow motor and the motor itself is connected to a steam valve and in gas furnaces, if desired, to a gas valve, to cut down the steam pressure to a point for which the device has been set.

I am aware that there are various types of In my-device the primary object is to provide a piston which moves from one position to another as controlled by a sliding valve or plunger, and in-which the plunger is at all times surrounded by a constant flow of the wer medium, so that it is substantially.

rictionless in operation.

' While I have illustrated my invention as used with a sylphon bellows connected toav steam line, it will be understood that this is merely a showing of one of manypossible uses of my invention. v V

I accomplish the objects set` forth by that -certain construction and arrangement of parts to be hereinafter more specically 'pointed out and claimed. Y

In the drawings,

Figure g 1 is a central vertical` section through my device.

Figure 2 is a top plan view thereof.

Figure 3 is a side elevation thereof.

I have shown a sylphon bellows 1 connected to a by-pass steam pipe 2 in a steam line 3. I have also shown a steam valve 1 to control steam pressure.

Secured to the sylphon bellows is a lever 5 pivoted to a framework 6 and equipped with a eounterweight 7, which is adjustable.

The lever 5 has an arc-shaped shoe 8 on its outer end, to the upper en d of which is connected acable 9, said cable being secured to the plunger valve of the constant flow motor.

The flow motor is formed of a cylinder l() having a main bore 11 of true cylindrical shape, in which bore 11 the piston 12 is operated. This piston as shown has suitable cup leathers 13 and a piston rod 14 passing through a suitable boss in the cylinder head 15. The inflow pipe 16 enters the cylinder head, in this instance comprising` a water pipe carrying water under any normal city pressure.

At one side of the. cylinder are formed series of slots 17, vforming a vertical row of wide and narrow ports from the cylinder bore 11. l

The slots each open into a segmental pocket 18, there being a web of metal 19 between Aeach pocket. The webs 19 are bored with aligned holes and a valve plunger 21 is guided and reciprocates in these holes. The plunger passes out through the cylinder head, as in the case of the piston rod, and is secured to the cable 9. l

A bleed passage 22 is provided extending into the topmost pocket 18, and to the outiow port 28. This outiow port is connected to the lowermost segmental pockets, and water flowing through the chamber formed by the pockets and the bored webs, passes out through the said port. The fit of the plunger in the bores of the pocket partitions is preferably a loose one toavoid friction.

It may now be observed that theA valve Along the cable at some desired point is connected the device to be operated, in this instance the steam valve handle 27.

The piston is thus held upwardly inthe cylinder by. a weight suficient to counteract the action of the water on the piston, as

controlled by the valve.

below the lower end of the plunger.

Thus in any position of the valve thc counterweight and water pressure will act on the piston to move it toa position .-to uncover the next segmental pocket 'port lVhen the plunger isdepressed, the water cannot flow past the piston so it .forces the piston 'down at the same time operating the valve as at 27 'and raising the counterweight until the pistonuncovers a port. not blocked by the valve plunger. \VVh'en it. has reached such a position which it will do by .a steady as distinguished from a jerky manner, al

position of balance will befinaintained by 30 the counterweight and such friction as may be inherent in the device being operated` as the valve 27. It will be understood that the port through which the water is discharged is opened only sufliciently to balance the water pressure and permit a constant flow.

Upon raising of the plunger the port or ports above. the piston will be opened vincreasing the discharge of fluid and relieving the pressure on the 'piston as to vpermit the' counterweight to lift it and at the same time operate the member to be operated. This again will be a gradual operation.

As will be evident, myfconstructio-n embodies a moving control member under substantially no strain in overcoming water pressure as it moves from one position to another. Thus on the lower end of the plunger there is no pressure,V nor .at the upper end. Also lateral pressure is equalized except at the pocket partitions, which are more or less negligible. It also em bodies a piston which is always acted upon by two opposing forces seeking to come to balance, i'. e. the counterfo-rce and the water pressure. Y

A he resulting device'I have termed a c0nstant ilow motor for lack of a better term, since water continually flows through the device, except when momentarily blocked. The prima-ry purpose of the device is not supplying excess moti-ve power so much as transmitting the action of an undampe'd gauge indicator in a fully damped manner,

resulting from vthe counter-action of twoA forces on the motor'piston. As is apparent,

what I claim as new and desire to secure b v Letters Patent, is v 1. A device of the character described, comprising a cylinder and pistou therein, a series of ports in the cylinder. an inflow and outflow port for ingress and egress ot' motive fluid for the cylinder, the outflow port connected to said series of ports, and

a plunger movable to close and open the",l

ports of said series, and means foi-equalizing pressure of the motive fluid Aabout said plunger.

2. A device of the character described",`

comprising a cylinder, a series of ports in" the side thereof, pockets opening into said ports, said pockets having partitions between them, a valve plunger sliding through said partitions, a piston in the cylinder, a counterforce' for` thev piston, a motive fluid inlet to the cylinder at one end of the series of ports, and a motive fluid outletV for the series of ports located at the other end of the series of ports, as and for the purposedeseribed.

3. A counterforce .transmission device, comprising a cylinder, a piston therein, a counterbalance for thepiston, an inflow port and series of interconnected outflow ports lengthwise of the cylinder, and a valve.

plunger adapted to control the opening and closing of said orts.

4. A counterbalanced transmission device, comprising a cylinder, a piston thereii, a counterbalance for the piston, an inflow port, and a series of interspaced outflow ports, having a restricted passage between thernand an escape port at one end ofthe series, and! a plunger lying in the restrictedpassage and movable to close the passage between the ports, for the purpose described.

5. A counterba-lanced transmission device, comprising a cylinder, a' piston therein, a counterforce for the piston. an inflow port, and a series of interspaced outflow ports, having a restricted passage between them and an escape port atone end of the series, and a plunger lying in the restrictedpassage and movable to close the passage between the ports, for the'purpose described, and means, for equalizing pressure'` on said 'plunger as against the motive fluidvmedium WILEY CRAIG.

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