US2369731A - Pulsator for milking machines - Google Patents

Pulsator for milking machines Download PDF

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Publication number
US2369731A
US2369731A US44663642A US2369731A US 2369731 A US2369731 A US 2369731A US 44663642 A US44663642 A US 44663642A US 2369731 A US2369731 A US 2369731A
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United States
Prior art keywords
valve
chamber
valves
pressure
chambers
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Expired - Lifetime
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English (en)
Inventor
Forsberg Erlk August
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Alfa Laval Holdings Amsterdam AB
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Separator AB
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01J—MANUFACTURE OF DAIRY PRODUCTS
    • A01J5/00—Milking machines or devices
    • A01J5/04—Milking machines or devices with pneumatic manipulation of teats
    • A01J5/10—Pulsators arranged otherwise than on teat-cups
    • A01J5/12—Pulsators arranged otherwise than on teat-cups with membranes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2544—Supply and exhaust type
    • Y10T137/2546—Vacuum or suction pulsator type [e.g., milking machine]
    • Y10T137/2549—With trip linkage or snap action

Definitions

  • Figure 1 is a longitudinal section-showing the construction of "apreferred form of pulsator.
  • Figure 2 is a fpartialsection or an alternative form ofv motor member adapted for use with the same control and valve members shown in Fig. .1.
  • 'A desirable ratio for the dimension of pistons K andF. is such that the diameter of the former is the square root of two times that of the latter.
  • -ChamberL is connected, through port A, with vacuum passage A.
  • Chamber M is connected througha port R with 'apassage R.
  • Passage R communicates at one end with.
  • chamber [N and at its other end is adapted for connection with one.
  • Passage S communicates at one end with chamber? and at its other end is adapted for connection with another pair of.
  • Figure 3 is :a .similaipartialsection showing another form. of .motor member.
  • Thepulsator adapted for operation bythe difference betweentwopneumatic pressures, the higher being atmospheric and the lower, usually abouthalf of atmosphricfhereinafter referred to as vacuum.
  • valve'C are connected by passages D and G with the urrounding atmosphere.
  • the left head of double valve ,initslmovement to left and right in chamber P contacts alternately with a smaller, valve seat adjacent chamber D and a larger seat adjacen't chamber B,'while the rightv head, in chamber'N, contacts alternately with a Air also flows from and small diaphragms K of the double valve pheric pressure on
  • the chambers correspon'ding'to chambers M and L of Fig. 1 are lettered M andL".
  • Air can flow through'passageG' and chambers G and 'E' to chamber N whereit' presses the right hand end C toward the left because its other side is "exposed to the vacuum of large diameter chamber B. This force is opposed by atmospheric pressure from chamber D but be cause this chamber is smaller the net 'force' is toward the left.
  • a bellows H,-,inside chamber G,. is compressed and elongated by movement, of rod I and in its the rightis much greater than that toward the leftifromsmaller piston]. with atmospheric pressure on its right .end and vacuum on its left end. The pistons and the rod I begin to move K and F or Fig. 1. p
  • Chamber M is now connected, through passages R and R, chambers N and B and passage A with vacuum. Because there is vacuum on both sides of piston K it has no force in either direction, but piston F, with atmospheric pressure at its right end and vacuum at its left, has a strong force toward the left and, through rod I, expands bellows H, as fast as air can flow in through port '1, until the boss adjacent the bellows contacts the right end of double valve 0. It will then pause, as it did in the movement toward the right, until the resistance of the bellows becomes less than the difference between the leftward force of piston F and resistance to movement of valve C, which is now a force toward the right, when the valve and other parts will quickly complete'their stroke and conditions will be those at the start.
  • a pneumatic pulsator comprising means providing a channel adapted for connection with a source of relatively low pneumatic pressure and a passage in which pneumatic pulsations are adapted to be produced, a member comprising valves adapted in one position to connect said passage with said channel and in the other position to connect said passage with a source of relative- 1y high pneumatic pressure, an expansible and contractible fluid-containing chamber, a'second fluid-containing chamber, means allowing only restricted fiow of fluid between said chambers, each of said chambers being otherwise closed against admission or escape of air, a valve-actuator movable independently of said valves in one direction to first contract the first named chamber to cause fluid to flow therefrom into the other chamber and to then shift said valves from one position to the other and movable in the other direction independently of said valves to first expand the previously contracted chamber to thereby cause fluid to flow into it from the other chamber and to then reverse said valves, said valve actuator having pressure faces one of which is in fluid communication with said passage and which is therefore subjected to alternate high and
  • a pneumatic pulsator comprising means providing a channel adapted for connection with a source of relatively low pressure and two passages in which pneumatic pulsations are to be produced, a reciprocable member comprising valves adapted in one position to connect one of said passages with said channel and the other with a source of relatively high pressure and in the other position to reverse said connections, an expansible and contractible fluid-containing chamber, a second fluid-containing chamber, means allowing only restricted flow of fluid between said chambers, each of said chambers being otherwise closed against admission or escape of air, a valve-actuator movable independently of said valves in one direction to first contract the first named chamber to cause fluid to flow therefrom to the other chamber and to then shift said valves from one position to the other and movable in the other direction independently of said valves to first expand the previously contracted chamber to thereby cause fluid to flow into it from the other chamber and to then reverse said valves, said valveactuator having pneumatic pressure faces one of which is connected with one of said two passages and which is therefore subjected alternately
  • valve-actuator comprises a piston having the specified pressureface that is sub. jected to alternate high and low pressures and having also an opposing pressure face of relative- 1y small area communicating constantly with a source of relatively high pressure, a piston rod extending and slidable throughsaid valve memher, and means movable with the piston and piston rod adapted to contact with the valve member to effect its shift as specified.
  • BJ A pneumatic pulsator as define'd'in'claiml "in having -the-specifie'd pressure face that'is-subiic'ted “to alternate high and low pressures and having also an opposingpressure face of relatively "small area communicating constantly with a source or relatively high pressure, the ratio "between-the diameters of the two opposing pr'essure tapes being approximately lzx/Z'. v 'l.
  • -"A' pneumatic pulsator comprising means'pr oadding a channel adapted for connection with a 'seu'rceof relatively low pneumatic pressure and a passage I in which pneumatic pulsations are adapted to be produced, amember comprising valves adapted in one position to connect said passage with said channel and in the other position to connect said passage with a source of relatively high pneumatic.
  • valve-actuator comprising two spaced apart diaphragms of different areas and a piston rod connected with both diaphragms, said valve actuator being movable independently of said valves in one direction to contract the first named chamber to cause fluid to flow therefrom into the other chamber and to then shift the valves from one position to the other and movable in the other direction independently of said.
  • valves to first expand the previously contracted chamber to thereby cause fluid to flow into it from the other'chamber and to then reverse the valves, means to maintain the space between the two diaphragms of the valve actuator in connection with a source of low pressure, means adapted to maintain the outer face of the smaller diaphragm subject to a source of higher pressure, and means controlled by said valves in their specified movements to subject the outer face of the larger diaphragm to alternate higher and lower pressures, each of said valves having its opposing faces open to high and low pressure respectively, opposing valve seats for each valve, the seats against which the low pres-v sure sides of the valves contact being of greater diameter than those against which the high pres- .sure sides of the valve contact, whereby the' valves, when at either end of their stroke, are held at that end solely by fluid forces and oiTer resistance to movementby the actuator.
  • a milking machine pulsator comprising a casing, a pneumatic braking device at one end of the casing, a valveactuator comprising a pneumatically controlled device at the other end of the casing and a rod connecting said devices, a double poppet valve, sleeved on said rod, between said devices and having a limited movement in opposite directions, the casing having two ports adapted for constant connection with a source of high pressure, one port between the valve and which said valve actuator comprisesapiston I twormembersofthedoublevalve and having also a-passageadapted in the oppositepositions of the valveto' be -connected alternatelywith one of said high pressure ports and said low pressure port,
  • a milking machine pulsator comprising a casing, a'pneumatic braking device at oneendof,
  • valve actuator comprising a pneu matically controlled device at the other 'endof the casing-and arodsecuredto and connecting said pneumatically --controlled device and braking l device, two spac'ed' apar't poppet valves and a hub carrying said valves and sleeved "on said rod, thereby providing a double valve, inner and outer valve seats for each valve, the inner valve seats being of a substantially greater radius than the outer valveseats, there being high pressure ports in constant communication with the spaces outside the valves and a low pressure port in constant communication with the space between the valves whereby the opposing pneumatic pressures on the valves tend to hold them in either end position to which they are moved, there being also a pulsation passage between the two valve seats of one of the valves, and means including a branch from said passage to said valve actuator whereby the alternate high and low pressures in said pulsation passage, produced by reciprocation of the valves, effect movement of the valve actuator in opposite directions, the range of the
  • a milking machine pulsator comprising an enclosing casing, a double poppet valve and a valve actuator, comprising a pneumatically controlled device and a rod, arranged and movable along a common axis; a valve-speed regulator comprising two air-containing chambers bounded by three walls, namely, a rigid wall between and common to said chambers and two walls one at least of which is flexible, there being fluid communication between said chambers of restricted and constant fluid flow capacity, said chambers being otherwise closed against admission or escape of air; said casing having a high pressure port, a low pressure port, and a pulsation pas- ;Jsage; said valve having a limited movement along said axis into two opposite positions, in one of which it connects said pulsation passage with one of said ports and in the other of which it connects said pulsation passage with the other of said ports, means including a branch from said passage to said valve actuator whereby the alternate high and low pressures in said pulsation passage effect movement of the
  • valve actuator in its said movements, alternately expanding and contracting one of said chambers and in the forepart of each of said movements moving independently of said valve and for the remainder of its movement engaging the valve and shifting it from one to the other of its said positions.
  • a milking machine pulsator comprising a casing having therein ports adapted to communicate with sources of respectively high and low pneumatic pressure and a pulsation conduit, and enclosed within the casing at one end a pneumatic braking device and a valve actuator comprising a pneumatically controlled device at the other end of the casing and a piston rod connecting said two devices; a double poppet valve sleeved on said rod between the valve actuator and the braking device and movable into two opposite positions adapted to connect said ports respectively with said pulsation passage to produce therein alternate high and low pressures, means whereby the alternate high'and low pressures in said pulsation conduit effect movement in opposite directions of the valve actuator and rod along the latters axis against the action of said pneumatic braking device; said braking device comprising two air-containing chambers bounded by three walls, namely, a rigid wall between and common to said chambers, another wall constituting the second wall of one of said chambers and a bellows constituting the second wall of the other
  • a milking machine pulsator as defined in 20 claim 8 comprising means adapted to apply to the valve, when seated at either end stroke, differential pneumatic pressures tendin to hold it seated and adapted, when unseated by the valve actuator, to equalize said pneumatic pressures and thereby allow the stroke of the valve to be quickly completed.

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  • Life Sciences & Earth Sciences (AREA)
  • Animal Husbandry (AREA)
  • Environmental Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
US44663642 1941-09-24 1942-06-11 Pulsator for milking machines Expired - Lifetime US2369731A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2369731X 1941-09-24
SE885174X 1941-09-24

Publications (1)

Publication Number Publication Date
US2369731A true US2369731A (en) 1945-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
US44663642 Expired - Lifetime US2369731A (en) 1941-09-24 1942-06-11 Pulsator for milking machines

Country Status (2)

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US (1) US2369731A (fr)
FR (1) FR885174A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3080881A (en) * 1958-10-13 1963-03-12 Fmc Corp Sequential irrigation valve
US3211416A (en) * 1963-09-27 1965-10-12 Sloan Valve Co Flush valves
US5692724A (en) * 1995-06-07 1997-12-02 Neles-Jamesbury, Inc. Method and apparatus for attenuating high frequency vibration sensitivity in a control valve positioner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3080881A (en) * 1958-10-13 1963-03-12 Fmc Corp Sequential irrigation valve
US3211416A (en) * 1963-09-27 1965-10-12 Sloan Valve Co Flush valves
US5692724A (en) * 1995-06-07 1997-12-02 Neles-Jamesbury, Inc. Method and apparatus for attenuating high frequency vibration sensitivity in a control valve positioner

Also Published As

Publication number Publication date
FR885174A (fr) 1943-09-07

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