US1742848A - Electric pump - Google Patents

Description

Jan. 7, 1930e w. A. cHRYsT ET A1.J 1,742,848

' ELECTRIC PUMP Filed June l, 1925 Y .z sheets-sheet l Jan. 7, 1930.

W. A. CHRYST ET AL ELECTRIC PUMP 2 sheets-shed 2 Filed June 1, l19,25

Patented Jan. 7,1930

UNITED STATESI PATENT OFFICE WILLIAM A. CHBYST AND HERBERT C. WALTEBS, 0F DAYTON, OHIO, ASSIGNOBS, BY HESNE ASSIGNMENTS, TO DELCO-REMY CORPORATION, 0F DAYTON, OHIO, A COR- PORATION OF DELAWARE ELEUIBIC :PUMP

Application med June 1,

This invention relates to electrical pum s for pumping liquids, and particularly to t e type of electrical pump described and claimed in the patent of Hugh Wallace #1,690,348,

issued Nov. 6, 1928, filed May 25, 1925. This patent discloses an electrical pump including an electromagnet having a magnetic circuit including two movable members one of which is the plunger of the pump and the other is a vibratory ymember which controls the opening and closing of the magnet circuit and which is maintained in a state of motion by intermittently connecting the magnet with a source of current.

One of the objects of the presen-t invention is to improve the durability of a pump of this type and particularly to improve the manner of hinging the vibratory member.

A further object is to provide means responsive to pressure in the outlet connected with the pumpfor rendering thepump ino perative. y In the disclosed form of the present invention this is accomplished by mechanism responsive to pressure for preventing movement of the vibratory member to close the switch contacts controlling the pump magnet coil.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein preferred forms of the present invention are clearly shown.

In the drawings: y

Figs. 1, 2 and 3 are plan, side and sectional views of a form of the present invention, Fig. 3 being taken on the section line 3 3 of Fig. 1;

Fig. 4 is a view in elevation of a knife-edge bracket providing a fulcrum for the vibratoryY member of the pump;

Fig. 5 is a plan View of a modified form of the invention Y,

Fig. 6 is a side view in the direction of the 1925. Serial No. 34,074.

parts being shown the drawings the parts providing the fuel duct, pump cylinder and piston are identical. Referring particularly to Fig. 3, this fuel duct includes an inverted cu -shaped inlet member 20 having a threaded ole 21 for ref ceivingv an inlet ipe. The member 20 is provided with a tu ular extension 22 which is maintained in engagement with the lower end of a tubular magnetcore`23 of magnetizable material by a tubular screw 24 having a shank which passes thru the extension 22 and threadedly en ages the core 23. The cylindrical head of he screw 24 is surrounded by a strainer screen 25 admitting passage ot' liquid through, thepassages 26 and 27 in the screw 24. The head of the screw 24. istapped to receive a' bolt 28 which attaches to the member 20 a vessel 29. 'A gasket 30 is located between the rim of the vessel 29 and the member 20, and a gasket 31 is located between the vessel 29 and the head of the bolt 28.

The core member 23 is attached toa plat` inder 38 and the couplin 39 is sealed by a gasket 41. A piston 42 o magnetizable material is slidable within the cylinder 38 and is .maintained normally in the position shown 5 in Fig. 3, by spring 43 located between the pistonand the core 23. The cylinder 38 is surrounded by a'magnetizable collar 44 in engagement with the magnet frame 34. The

cylinder 38 and the core 23 are surroundedV lo by magnet coil 45. When this coil is connecte'd with a current source, the piston 42 will be moved toward the core 23. The downward movement of the piston toward the core 23 is limited by a non-magnetizable stop meinber 46, having a flange 47 which is received by a groove 48 in the core 23 and having a conical surface 49 conforming to a similar conical surface of the core 23 and having a cylindrical portion 50 which receives the 2 lower, end of the spring 43 and which telescopically engages the piston 42. The stop member 46, therefore, cooperates with the cylinder 38, the core 23, and the piston 42 to provide a dashpot which retards the downg5 ward movement of the piston and, therefore,

cushions the impact of the piston against the Istop member 46. The dashpot for retarding the upward movement of the piston 42, is provided by forming the piston with a portion )o 51 reduced in diameter, which is adapted to telescopically engage the coupling 39. The screw 24 and the piston 42 provide seats for valves 52 and 53 respectively, which are retained by valve cages 54 and 55 respectively, u each having three legs 56 adapted to be received by grooves 57 provided in each of the members 24 and 42 respectively. the reciprocation of the piston 42 will cause the liquid to be drawn in through the opening 21 and to be forced out through the opening 40.

The mechanism for intermittently connecting the magnet 45 with a source of current includes a vibrator member 60 having poles 61 and 62 cooperating, respectively, with the oles 35 and 36 of the magnet frame 34. he vibratory member 60 is provided with notches 63 for receiving knife edges 64 extending from a bracket 65 which is attached to the magnet frame 34. The parts 60 and 64 are maintained in engagement by two springs v66, each having one end attached to a bracket 67 secured ,by rivets 68 to the magnet frame V34. The other ends of the springs 66 are secured to a rtured ears 69* formed on the late 69, said plate having resilient fingers 70 or yieldingly engaging the vibratory niember 60. The plate 69 is secured in various positions of adjustment with respect to the vibratory member 60 by a screw 71 which passes through the slot 72 in the plate 69 and threadedly engages the member 60. Springs 66 are secured between bracket 67 and the ears 69* of the plate 69 so that the springs are U5 under tension, thereby holding the vibratory Obviously,`

member upon its fulcrum. Plate 69 should be positioned upon the vibratory member so that normally the tension of the springs will hold the vibratory member in circuit closing position as illustrated in Fi .9. When the said member is attracted by t, e pole pieces of the field frame, the action of the ears 69 of plate 69, due to the rocking of the vibratory member, will -flex the convolutions of the springs out of alignment (see Fig. 10) thereby increasing the tension of the springs which tension reacts to return the vibratory member to normal circuit closing position when the said member is no longer attracted by the pole pieces. The position of the spring connections on ears 69a relative to the fulcrum of the vibratory member controls the contact pressure of ther interrupter and the frequency of operation of said member. Moving the plate 69 a greater distance from the said fulcrum will increase the contact pressure and decrease the frequency of operation and the moving of said plate toward the fulcrum will produce less contact pressure and faster operation. The screw 71 is provided with a portion of reduced diameter which extends through a hole 73 in the knife-edge bracket 65. The reduced diameter screw portion and the bracket 65, therefore, cooperate to limit the swinging of the member 60. The screw 71 is provided with a groove 7 4 for receiving a split ring 75 which is adapted to engage the bracket .65 and limit the unscrewing of the screw 71 out of the member 60 so that the member 60 will not be separated from the knife-edge support 65 when the screw 71 is turned to permit adjustingv the plate 69.

rlhe vibi'atory member 60 carries the contact 80 which cooperates with the contact 81 to control the circuit of the magnet coil 45. The contact 81 is attached to a leaf spring conductor 82 which with the, stop member' 83 is attached by rivets 84 to a non-conducting plate 85 which in turn is secured by rivets 86 to a bracket 87 secured by rivets 87 to the pole 36 of the magnet frame. `The stop member 83 is provided with a hook 88 to which is attached a wire 89 connected with one end of the magnet coil 45. The other end of the magnet coil is connected with a terminal bolt 90 which is insulatingly supported by the bracket 32. The plate 69 is adjusted along the vibratory member 60 so that springs 66 tend to urge the contacts 80 and 81 into engagement and the member 60 away from the poles 35 and 36. To separate contact 80 from the contact 81. the magnet 45 is connected with the source of current by a, switch 91 which connects a battery 92 with the terminal 90. The circuit to the magnet coil is completed through the contacts 80 and 81 and by ground connection indicated at 93 and 94 between the bracket 32 and the battery 92. As soon as the coil 45 is energized the piston 42 will be attracted toward the core 23 and be repeated, the frequenc vof t 's cycle depending upon the natura frequency of the vibratory member 60. During a portion of the movement of the member 60 toward the ` poles 35 and 36, the engagement between the contacts and 81 is maintained, therefore,l there will be a slight sliding of the contact 81 upon the contact 80 before separation takes place, and again after engagement is resumed. In this way the contact surfaces are maintained relatively clean so that sticking of the contacts will not take place.

The pipe coupling 39 is` threaded to receive a nut which retains in position an inverted cup-shaped cover 96 resting upon the platform. A gasket 97 is' located between the nut 95 and the coupling 39. One portion of the rim of the cover 96 engages the portion 34a which is formed from the frame 34 to receive the screw 37. Opposite to the portion 34a therim of the cover 96 is secured to a lug 197 which extends through a hole 98 in the bracket 32.

Instead of the nut 95, the couplin 39 is Yadapted to receive a nut 100 shown in ig. 6,

which is attached to a plate 101 to which one end of a metal bellows 102 is secured. The opposite end of the bellows is secured to a plate 103 connected with a pipe couplin 104 adapted to receive a nipple 104a secure to a pipe 104b which leads to the carburetor, not shown. The bellows 102 will expand as the pressure of the liquid therein increases, order to operate a device for rendering the pump inoperative when the pressure in the bellows 102 exceeds a certain amount. In order to permit movementof the bellows 102 the i 104b'which is adapted to be connected wit t 1e coupling 104 should be flexible. The mechanism operated by the bellows 102 includes bifurcated levers 105 and 106, having yokes 107 and 108, respectively, and pivotally supported by rods 109 and 110, respectively, which are carried by ears 111 and 112, respectivel provided by a bracket 113 which is attache by rivets 114 to the pole 35 of magnet frame 34. A spring 115 is located f between the yoke 107 ofv lever 105 and the bracket 113, and normally maintains screws 116 carried by lever 105 in engagement with the plate 103. Screws 116 are threaded through the lever 105 and are maintained in adjusted position by lock nuts 117; kLever 105 isconnected by springs 118 with studs 119 carried by the lever 106. When the pressure within the bellows 102 is normal, the plate 103 will be located substantially ai shown in Figs. 6 and 7, and the center lines of the springs 118 will be located to the left of the axis of the rod 110. Therefore, the springs 118 will tend to move the lever 106 clockwise so that the stop 120 provided by the lever 106 will engage the'bracket 113. lfVhen the lever 106 is inthisposition, the screws 121 carried thereby will be' maintained out of engagement with the vibratory member 60. The screws 121 arethreaded through the lever 106 and are maintained in the desiredposition of adjustment by lock nuts 122.

If the pressure in the bellows 102 should exceed a certain amount the plate 103 will exert pressure upon the screws 116 in order to move the lever 105 counterclockwise to shift the center' lines of the springs 118 to the right of the'axis of the rod 110. This will cause the lever 106 to move counterclockas to move the lever 106 and the'screw 121 out ofcontact with the vibratory member 60, so that the operation of the pump may be resumed. In this manner the delivery of liquid from the pump is controlled by the pressure of the liquid in the duct connectedy with the outlet of the pump. This feature is advantageous especially where the apparatus is used to pump .gasoline from a tank to the float chamber of the carburetor. When the fuel in the carburetor exceeds a certain level, the float valve of the carburetor will stop the iiow of fuel thereto. Therefore, the pressure of the fuel in the bellows 102 will increase until the bellows expands sufficiently to cause the screws 121 to engage the vibratorymember 60, stopping the pump as described. As fuel in the carburetor bowl is consumed, the oat valve will open to connect the pump and carburetor bowl, and the pressure of the'liquid inthe bellows 102 will diminish to permit the pump to operate again.

Figs. 6, 7 and 8 show a modified form of mounting the vibratory member 60. A bracket is attached by rivets 131 to the frame 34 and is provided with a knife-edge fulcrum 132 received by the notch 63 of the member` numbered 203 in Fig. 8. Both openings 202 and 203 are in alignment and are of considerably larger transverse dimension than the pins 133.

In order to vary the pressure ofthe contact 80 upon the contact 81, the springs 136 are so constructed that the ends 201 and 202 thereof are located substantially on the same side 'of the axial center of the spring. lfVhen it is desired to cause the contact 80 to engage the contact 81 with a greater pressure, the springs 136 are rotated relative to the washers 135 and the bar 137 so that the ends of the spring 136 are located a reater distance below the center line 200 of t 1e pivot formed by the notch 63 and knife-edge 132. In Fig. 8, one of the springs 136 is shown adjusted to the position in which it will exert the greatest turning force onV the bar 137. Here the ends of the spring are located a distance below the center line of pivot, equal to half the diameter of'the spring. If the spring is rotated so that its ends would lie on the line 200 then the force of the spring to turn the member 60 about the pivot or knife-edge would be substantiall nil. If the spring ends are adjusted to 'e above the line 200 then the springs would exert a force to move the number in a clockwise direction about the pivot and thus hold open ther contacts and 81. Consequently it may be seen that the spring ends 201 and 202 must lie beneath the center line 200 to e'ect operation of the member 60 to close the contacts.

Instead of bein a part of the member 83, the clip 88 is ma e a part of a member 138 which, with the members 82 and 83, is atf tached by rivets 139 to a non-conducting block 140. The block 140 is attached by rivets 141 to a bracket 142, ,which is attached to the pole 36 of the magnet frame 34.

While the forms of embodiment of the invention as herein disclosed, constitute preferred forms, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

yWhat is claimed is as follows:

1. An electric pump comprising, in combination, a luid-recelving chamber, means for displacing fluid therefrom, an electromagnet for operating said means and having a magnetic circuit including a magnet frame having spaced poles, a magnetizable member mounted to vibrate between said poles, a switch for controlling the magnet circuit and having contacts separated by movement of said vibratory member toward said poles, a spring connected with the vibratory member and tending to maintain it in position for closing the contacts, and means for holding the spring in various positions of adjustment which shift its center line of action with respect to the fulcrum of said vibratory member.

2. An electric pump comprising, in combination, a fluid-receiving chamber, means for displacing fluid therefrom, an electromagnet for operating said means and having a magnetic circuit including a magnet frame having spaced oles, a magnetizable member mounted to v1 rate between said poles, a

switch for controlling the magnet circuit and l ber.

3. An electric pump comprising, in combination, a fluid displacement member; an expansible outlet chamber; anelectro-magnet for operating said displacement member; a circuit interrupter for controlling the operation of the electro-magnet; and means adapted to be operated by the expansion of- 'the outlet chamber in response to increasing pressure therein for rendering the circuit interrupter inoperative.

4. An electric pump comprising, in combination, a fluid inlet chamber; an ex ansible fluid outlet chamber; means for li ing fluid from the inlet chamber and delivering it under pressure to the outlet chamber; an electro-magnet for operating said means; a circuit interrupter having a vibratory magnetiza-ble member included in the magnetic circuit of the electro-magnet, and operated by said electro-magnet intermittently to disconnect said magnet from a current source; and means adapted to be moved into engagement with the vibratory member by the expanding movement of the inlet chamber in response to increased fluid pressure therein, for rendering said vibratory member inoperative.

5. An electric pump comprising, in combination, a fluid-receiving chamber, means for displacing fluid therefrom, an electromagnet foroperating said means and having a magnetic circuit including a magnet frame having spaced poles, a magnetizable memberl mounted to vibrate between said poles, a switch for controlling the magnet circuit and having contacts separated by movement of said vibratory member toward said poles, a spring connected with the vibratory member and tending to maintain it in position for closing the contacts, a plate adjustably secured to the vibratory member, providing means for securing the spring to said member and adapted to be moved into various positions of adjustment whereby the center line of` spring action is'shifted with re- K spect to the fulcrum of said vibratory mem.- ber, and a screw for securin the adjustable plate to the vibratory mem er, said screw having an extending portion which cooper- I ates with the mounting of the vibratory member to limit the movement of, and substantiallyinrevent the removal of said member. 6.

electric pump comprising, in combination, a fluid-receiving member, means for displacing fluid therefrom, an electromagnet for operating said means and having a magnetic circuit including a magnet frame having spaced ole's, a magnetizable member -mounted to vi rate between said` poles, va

switch for controlling the Ymagnet circuit and having contacts` separated by movement of said vibrator member toward said poles, a bracket carried by the magnet fra-me andy providing a knife-edge bratory member, a'spring for maintaining the fulcrum for 'said vibination, a fluid displacement member, an

electromagnet for operating said member, a

/ vibratory circuit interrupter for controlling the operation of the electromagnet, a fluid signatures.

' WILLIAM A. CHRYST. HERBERT C. WALTERSK.

member upon its fulcrum and normally in y circuit closing position; a plate adjustably secured to said vibratoryy member 'and projviding an anchorage for the ring, Asaid plate lbeingl adjustable into di erent posi-vv tions to sliit the center line ofpring, action y e vi with respect to the fulcrum of ratory member; and a screw for holding said plate in adjusted position u n the said member, said screw having its ank ing through an aperture in t e bracket and cooperating therewith to limit the movement of said vibratory member.

7. An electric vlpump bination, a fluid disp a'ccment member, an expansible outlet chamber, an electromagnet for operating said displacement'member, circuit interru ting means for controlling the outside theoiitlet chamber a bination, a fluid operation o the electromanet, and means vcomprising in com-v pdtobe oper-f rtion extend-y i atedA b said outletchambsvarY when it is exvpende in responsetoincreasng ressures ecircuitwithin said chamberzflor rendering interrupting means inoperative.

8. An electric pump `comprising in comacement member, an 1 expansible iluid receiving chamber, an electromagnet foroperating the displacement y member2 a vibratory circuit interruptor for controlling the operation of the electromagnet, and -means without the fluid receivin chamber, adapted to be engaged by said ui receivinghchamber and moved into engagement wit the vibrato circuit mterrupter to render it ineffective w en the Huid receiving chamber has been expanded in response to increasing fluid pressures therein.

9. An electric pump'comprising in combination, a fluid displacement .member, an electromagnet for operating said member,

Y means for controlling the operation of the electroni electromagnet, an expansible fluid receiving chamber,'and means without said chamber adapted to be moved into engagement' with the et contro means by the expansion o. the receiving ber in response to increaslngpressures therein to. render the electromagnet inoperative.r

10. yAn electric pump comprising in com

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