US2681253A

US2681253A - Liquid distributing system

Info

Publication number: US2681253A
Application number: US263662A
Authority: US
Inventors: Hagelin Boris Caesar Wilhelm; Ljungdahl Staffan
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-05-13
Filing date: 1951-12-27
Publication date: 1954-06-15
Anticipated expiration: 1971-06-15

Description

June 15, 1954 B. c. w. HAGELIN ETAL LIQUID DISTRIBUTING SYSTEM Original Filed May 13, 1949 FIG. 5. F/GJ.

llllllll Patented June 15, 1954 2,681,253 ICE 2,681,253- LI'QUID DISTRIBUTING SYSTEM Boris Caesar- Wilhelm. Ha

Staffan Ljungdahl, Ake

Sweden Original application May 13,, 1949,, Serial gelin, Stockholm, and

slund; near- Stockholm,

93,042. Dividedand this application December 27, 1-951; Serial'No. 263,662

Claims priority,

8 Claims.

The present application is divided out from our oopending application Serial No. 93.042, filed May 13, 1 949, entitledMethod of and Means for Distributing Liquid Matters.

The invention relates to a liquid injection device for use in connection with liquid distributing system in which. the liquid fed to theinjection devices is subjected to a pulsating pressure. example of such a system is described in our copcnding application Serial No. 93,042, filed May 13, 1949.

An object of theinvention is to provide a liquid injection devicehaving means operableunder the control of the pulsating pressure of the liquid fed to the device for effecting a forced ejection of the liquid at intervals corresponding to the frequency of the pressure pulsations oi the-liquid.

Another object of the invention is to provide such a liquid injection device having means for adjusting thecapacity of the device.

According to a feature of the invention the injection device is of a pump like structure, comprising as main elements a cylinder and a reciprocable plunger therein with connections and stroke of the plunger, causing. it to eject a quantity of liquid supplied to the cylinder by thepreceding impulse.

According to another feature of the invention the injectionv device is provided with a passage extending between the cylinder chamber at the rear end of the plunger adapted to be acted on by the pressure impulses and the cylinder chamberat the front end of the plunger in com-munication with the outletopeni-ng of the" cylinder, and an automatic valve for controlling the how of liquid through said passage, so as to allowsuo-h flow during the return stroke of the plunger While interrupting it during the operativestrolre ofthe plunger.

A further feature of the invention related to said last-mentioned feature resides in the provision of a non-returnvalve between the inlet of the cylinder and the cylinder chamber at the rear end of the plunger forallowingthe'operation of said automatic valve under the influence of pressure differences inside the device.

In the accompanying drawing two forms of the invention are illustrated" by way of example.

Figs. 1 and 2. are. longitudinal sections of an embodiment in the plunger,

Fig. 3 isanaxial section of theother embodimerit and Fig. dis a portion of Fig; 2 on a larger scale.

With reference to Figs. 1 and 2, the reference ally positioned inlet Zilandan

outlet

28, 29 in its bottom end. Preferably, .the outlet may take theshape of a spraying nozzle; especially where two end positions of the a cylinder, having a laterapplication Sweden May 15,1948

. non-returnvalve 7 channel l. 26, but since the device is to be used in a fuel distributing system. Slidably mounted in the cylinder is. a. plunger 25 which may reciprocate between the bottom of the cylinder and an upper stop formed by a screw 22 which may be controlled from outside the cylinder. The plunger is formed be:- tween its ends with an annular recess 23 in the circumferential surface in the middle portion of which an annular projection 25' is made, the upper and lower edges of which are obliquely undercut so as to form sharp knife-edges as. best shown at 25 and 25 respectively, in Fig. 4. Placed in said recess 23 the projection 25 is an elastic sleeve 24 having inwardlyprojecting flanges at its ends which embrace the upper and lower edges of the projection 25, preferably under a certain initial pressure. By this means a high sealing effect is ob tained at the sharp edges of projection 25. The middle thin portion of sleeve 24 covers theopenings of two channels formed in the plunger, viz. an upwardly extending channel- 26 opening into the top surface of the plunger and a extending channel 27' opening into the bottom surface of the plunger. Formed in the bottom or" the cylinder in register with the channel 27 is a boring 28 ending in a narrow aperture 29, which as already stated may be shaped like a spraying nozzle.

The lower end portion of the plunger is of a reduced diameter and is surrounded by a spring 56 resting on the bottom of the cylinder which tends to force the plunger upwardly. The annular recess 23 communicates with the space above the plunger through a channel it having a widened central portion in which a non-return valve 42 is inserted for allowing a fiow of liquid from liquid to be ejected at each operative stroke of plunger. The operation is as follows:

The inlet Let it now be" assumed that liquid is contained in the cylinder including the lower cylinder chamber, below the bottomend of the plunger.

Assoon as a pressure impulse reaches the inlet 20 the pressure of said impulse is imparted through recess 23 and connection 41 past the 32 up into the cylinder chamber above the plunger. In such case the pressure prevailing on the external surface of sleeve 24 will be equal to the pressure prevailing on'that surface thereof which covers the opening of the-operative pressure surso asto snugly surround downwardly face of the sleeve is much larger on the external surface of the sleeve than it is on the internal surface thereof, the bypass channel will remain closed as long as the pressure is acting. The pressure in the cylinder chamber above the plunger will consequently force the plunger downwards, thereby forcing the liquid in the cylinder chamber below the plunger out through the outlet 2%, 2s by an elevated pressure. When the plunger reaches its lowermost position, as shown in Fig. 2, its downward movement, that is, its operative stroke is ended. As soon as the pressure impulse ceases, the return spring as will raise the plunger. Since the non-return valve 42 prevents the liquid from returning to the recess 23 and the inlet 29, a pressure above atmospheric will be attained on the top surface of the plunger and since no external pressure acts on the elastic sleeve, the pressure resulting from the liquid in the bypass channel section 25 will force the middle portion of the'sleeve outwards, so that during the upward, that is, return stroke of the plunger fuel may pass from channel section 25 to channel section 21 and reach the cylinder chamber below the plunger.

Fig. 3 illustrates the construction of the liquid injection device more in detail. The reference numerals are the same as those used in Figs. 1 and 2. In addition to the elements shown in Figures 1 and 2, Fig. 3 shows amongst others a filter 34 for the fuel entering through the inlet 26, furthermore there are

packings

35 and 35 provided in combination with the plunger on both sides of the annular recess 23, and vents 35 leading from the spaces above and below the plunger in the pump casing 16. The connection between the screw 22 and the pointer 43 comprises a rounded rack 3'! formed integrally with the screw 22 and axially extending teeth, not shown, of a transverse shaft 38 which in its turn controls the pointer.

In this embodiment the outlet boring 23 is formed with a reduced area approximately between its upper and lower ends, as shown at 23 and inserted in the wider lower portion of boring 2,8 is a non-return valve 28 loaded by an upwardly acting spring 28 The non-return valve 28 prevents dribbling in the intervals between the ejections, since said valve is normally closed and opened only under the action of the rising pressure in the lower cylinder chamber during the downward stroke of the plunger.

We claim:

1. A liquid injection device of the class specified comprising in combination, a casing having an inlet for a liquid adapted to be supplied thereto under a pulsating pressure and an outlet for said liquid, a reciprocable plunger in said casing adapted to be operated by the pressure impulses of the liquid supplied to said inlet for eifecting a forced ejection of a quantity of liquid through said outlet at each operation stroke of said plunger, a bypass being provided inside the device between the end surface of the reciprocable plunger adapted to be acted on by the pressure impulses and the outlet, an automatic valve for controlling the flow of liquid through said bypass, and a non-return valve inserted between the inlet and said liquid-operated area of the reciprocable plunger, said automatic valve being adapted to interrupt the flow of liquid through the bypass when the liquid pressure in front of the non-return valve is higher than the pressure behind said valve, andto, allow the flow of liquid portions of with an annular recess through the bypass when the pressure behind the non-return valve is higher than the pressure in front thereof.

2. In a liquid injection device in combination, a cylindrical casing having a lateral inlet for a liquid adapted to be supplied thereto under a pulsating pressure and an outlet for said liquid at one end, a reciprocable plunger in said casing for discharging the liquid through said outlet at an elevated pressure, a passage being provided between the liquid inlet and the end of the plunger remote from the outlet for allowing the liquid to displace the plunger towards the outlet, a non-return valve for controlling said passage, the plunger having further a by-pass formed in it which comprises two channel sections extending from opposite ends of the plunger to spaced points of the circumference thereof, and an elastic sleeve snugly fitting around the plunger so as to cover said points with its external surface. exposed to the pressure of the liquid at the inlet.

3. A liquid injection device as claimed in claim 2, and in which the plunger is formed on its circumierence with annular knife edges to act as tightening elements in cooperation with the elastic sleeve, said knife edges being engaged by said sleeve under an initial pressure for securing a high sealing effect per unit of area.

4. A liquid injection device as claimed in claim 2, and in which the plunger is under the control of a spring action for eifecting its return stroke, an adjustable stop being provided for determining the termination of said stroke and thus the quantity of liquid to be ejected at next operative stroke.

5. A liquid injection device as claimed in claim 2, and in which the plunger is externally formed with an annular recess between its ends for receiving the elastic sleeve, said recess being in permanent communication with the liquid inlet of the casing.

6. A liquid injection device as claimed in claim 2, and in which the plunger is externally formed between its end in per manent communication with the liquid inlet of the casing, characterized by the further feature that the plunger is formed with a channel between said annular recess and the end of the plunger to be acted on by the pressure impulses, the non-return valve being mounted in said passage in such a way as only to allow a flow of liquid in the direction from said inlet to said end of the plunger while positively preventing any flow of liquid in the reverse direction.

7. A liquid injection device as claimed in claim 2, and. in which the outlet of the cylindrical casing is provided with a spraying nozzle.

8. A liquid injection device as claimed in claim 2, and in which the outlet of the cylindrical casing is provided with a spraying nozzle, characterized by the provision of a non-return valve in front of said spraying nozzle.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,228,335 McClelland May 29, 1917 1,543,178 Meili June 23, 192 2,389,492 Edwards Nov. 20, 1945 2,506,528 Webb, Jr., et a1 May 2, 1950 2,569,233 Dickson et al Sept. 25, l951 FOREIGN PATENTS Number Country Date 594,6 l4 .Germany Nov. 2'7, 1932