MXPA97002570A - Sprinkler with precompression pump suction conception of inve - Google Patents

Abstract

The present invention relates to a sprinkler with a liquid precompression pump comprising. a pump body having a reciprocating pumping piston in a pumping cylinder to define a pumping chamber of variable volume, said piston has a discharge valve seat and a hollow stem defining a discharge passage controlled by a valve therethrough, a discharge head valve coupled to said valve seat in a closed discharge position under the direction of a return spring, plunger means on one end of said stem to be reciprocal to each piston to open said discharge valve upon reaching the threshold pressure within said pumping chamber, said plunger means includes a spray nozzle for the discharge having a discharge orifice and turning mechanisms in communication with said discharge passage, the improvement in which : said plunger means has a top end wall loaded with spring, manually engageable that changes axially and independently in re tion to said piston to define a variable volume reverse suction chamber in said plunger means in open communication with said discharge passage; spring means for spring loading said plunger means, comprising a spring having a spring force predetermined minus the maximum opposite pressure reached in said pumping chamber whose maximum pressure exceeds its threshold pressure during pumping, said terminal wall rotates toward said piston when spring loaded said spring in response to said maximum pressure, so as to reduce the volume of said chamber of inverse suction, and said end wall rotates in the direction of said piston rod in response to the restoring force of said spring during a return stroke of said piston, in order to expand said inverse suction chamber to attract inward any residual product in opposite direction of said discharge orifice and said gi mechanisms

Description

SPRINKLER WITH PRECOMPRESSION PUMP WITH REVERSE SUCTION FEATURE BACKGROUND OF THE INVENTION This invention relates generally to a sprinkler with a precompression pump of the finger operated variety and more particularly to a sprinkler in which the head of the plunger or a head cover is loaded with spring to change independently of the piston to define a variable volume reverse suction chamber in communication with the discharge orifice and with the turning mechanisms to suck in any residual product therein during the return stroke of the piston to avoid obstructions and to avoid dripping the product from the hole during pumping.

U.S. Patent No. 5,458,289 discloses a decompression pump sprinkler having a second pumping means defining a second variable volume chamber that decreases during the pumping pressure stroke and increases during the return stroke of the pumping. The second chamber is connected by a first valve to a supply channel during the return stroke to suck out any residual liquid in the second chamber. And, the second chamber is connected by a second valve to an outlet port during the next pumping pressure stroke.

U.S. Patent No. 5,348,189 discloses a dispenser with an air purge pump that provides quantities of liquid and air to pressurize them in separate chambers during pumping. The air is released during a terminal part of the driven stroke through a dispensing channel leading to the discharge orifice and the air and liquid mix during the pumping pressure stroke to be dispensed together and during a return blow to the air It is sucked through a dispensing channel to remove the residual liquid.

U.S. Patent No. 4,516,727 discloses a manually operated sprinkler capable of discharging air to the nozzle from within the sprinkler during the spraying operation. On the return stroke of the piston, the air chamber expands to suck air into that cylinder through the discharge orifice.

U.S. Patent No. 5,358,149 presents anti-occlusive means for a sprinkler with a precompression pump in which a variable volume internal air cylinder draws air through the discharge orifice during the pumping pressure stroke and sucks air from that orifice during the return stroke of the piston to avoid occlusions.

Known anti-occlusive sprinklers, however, generally provide pressurization of an air chamber at the beginning of the pumping pressure stroke so that the residual liquid in the discharge orifice in the section of the rotating driving mechanisms there drips from the hole before the product discharge valve opens, which is unacceptable. The variable volume air chamber is either in constant communication with the discharge orifice and the turning mechanisms or has valves in communication with them.

In addition, the anti-occlusive structures of the prior art are somewhat complicated and require additional parts that are added to the cost of production and assembly of the pump.

The term "turning mechanisms" used herein is meant to include the spinning or swirling chamber, tangential channels that feed the product into said chamber and discharge channels or a channel that leads from the discharge passage to the tangential.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reverse suction or reverse vacuum feature for a sprinkler with a precompression pump in which a reverse volume suction chamber of variable volume, in open communication with the discharge orifice and with its turning mechanisms, reduces its volume during pumping to reach a pressure maximum in the pump chamber exceeding a threshold pressure at which the discharge head valve opens. The foion of droplets and spills out of the discharge orifice is thus prevented during the firefighter before the discharge is opened. The volume of the inverse suction chamber increases immediately after the release of the external pressure from the fingers applied to the head of the plunger or the cover of the head at which time the discharge valve closes and any residual liquid from the discharge orifice and its turning mechanisms are directed inward by the negative pressure created in the expanded chamber to prevent occlusions as a result of stored dry product. This residual liquid product is available to be discharged together with the next pump charge after opening the discharge valve without dripping.

According to the invention, the head of the plunger has a terminal wall loaded with a spring, engageable to the fingers which defines an upper end of the inverse suction chamber and which is changeable with respect to the piston to reduce the volume of said chamber at the end of the blow of the piston pressure in respiration at the maximum pressure reached in the pumping chamber above the threshold pressure at. which the discharge valve opens. After the return stroke after closing the discharge valve, the end wall changes back to its initial position in relation to the piston under the action of the spring of the end wall to enlarge the internal suction chamber so that the sub-atmospheric pressure created there attracts any liquid waste inwards in the opposite direction of the discharge orifice and its turning mechanisms.

In one example of the invention, the terminal wall of the separately changeable plunger comprises an orifice cover having a valance portion covering the orifice in a non-use condition and discovering the orifice after application of a slight external force of fingers in against the weak directional first stage spring. Once the pressure in the pumping chamber has accumulated during the power stroke of the piston, a threshold pressure is reached which exceeds the force of the return spring of the piston to open the discharge. The pump pressure continues to increase to a maximum pressure beyond the threshold pressure, the maximum pressure exceeds the strength of a stronger second stage spring that directs the cover of the hole to allow the cover of the old orifice all the blow of displacement with the piston. At the beginning of the piston stroke, after relaxing the downward pressure applied by the operator against the cover of the hole, the restoring force of the spring of the second stage quickly returns the cover to its resting position enlarging the chamber. Reverse suction to attract the residual liquid into the discharge orifice and its mechanisms before the orifice closes with the cover under the spring action of the first stage spring.

According to another example of the invention, the head of the plunger is mounted on the piston rod for an independent change movement against the direction of a spring that allows a relative change after a maximum pressure reached in the pump chamber more beyond the threshold pressure at which time the discharge valve opens at the end of the pressure stroke of the piston. The release of the external pressure applied to the head by the operator allows the head of the plunger to change under the action of its cut to enlarge the inverse suction chamber to attract inward the residual liquid product from the discharge orifice and its mechanisms to avoid occlusions as a result of accumulated dry product. Other objects, advantages and novel features of the present invention will be more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a vertical sectional view of a sprinkler with a precompression pump having a reverse suction characteristic according to an example of the invention, illustrated in the non-use condition.

Figure 2 is a view similar to Figure 1 showing the pumping piston down in its cylinder during the power stroke; Figure 3 is a view similar to Figure 1 showing the pumping piston at the end of its pressure stroke with the discharge valve open and the reverse suction chamber completely reduced in volume; Figure 4 is a sectional view taken substantially along line 4-4 of Figure 1; Figure 5 is a terminal view taken substantially along line 5-5 of Figure 1; Figure 6 is a vertical sectional view of a sprinkler with a precompression pump incorporating a reverse suction feature according to another example of the invention; Figure 7 is an enlarged detailed view in section showing the relationship between plunger head and plunger rod in the non-use condition of Figure 6; Figure 8 is a view similar to Figure 6 showing the piston at the end of the pressure stroke before opening the discharge valve; Figure 9 is a view similar to Figure 8 showing the discharge valve open; Figure 10 is a view similar to Figure 7 showing the relationship between plunger head and piston rod in the condition of Figure 9.

DETAILED DESCRIPTION OF: THE INVENTION With attention now to the drawings in which the similar reference characters refer to similar and corresponding parts through the different views, a sprinkler with precompression pump is generally designated 10 in Figures 1,2 and 3 and comprises a pump body 11 having a pumping cylinder 12 containing a reciprocating pumping piston 13 which together with the cylinder defines a variable volume pumping chamber 14. The pumping cylinder 12 has a reduced diameter portion 15. which supports an insertion tube 16 at its lower end which extends inside the container (not shown) to which the pump sprinkler is mounted.

The upper end of the pumping cylinder is snapped or otherwise secured within the closure of the container with rope 17 provided to mount the sprinkler 10 to the neck with rope of the container. The crown portion 18 has a central opening through which a hollow piston rod 19 extends. A vent groove of the container 21 is provided in the crown portion 18 for venting the container in a manner similar to that described in U.S. Patent No. 4,051,983. Of course, the closure may be different from the type of clamp known to come into contact with an annular bead in the neck of the container, without departing from the invention.

The piston rod has a discharge valve seat 22 against which the nose of a discharge head valve 23 rests in the non-use or rest position of the pump sprinkler of Figure 1. The head valve is driven by springs in its closed position by a return spring of the piston 24 which may be in the form of a spiral spring extending between a shoulder 25 of the head valve and the lower end of the reduced diameter portion 15.

The head has a valve, feed seal 26 which may be in the form of an upwardly directed elastic conical valve disengaging from the wall of the upper end portion 15 to feed the liquid product into the pumping chamber during each stroke of piston suction and that it deforms elastically as in Figure 2 to close the feeding passage during pumping.

Plunger means comprising a plunger head 27 are fixedly mounted to the upper end of the piston rod 19, the hollow piston rod defines a discharge passage 28 that opens inside the head. Mounted on the head of the plunger is a cup of the hole 29 having a terminal wall containing a discharge hole 31, the orifice cup surrounds a probe 30 and with it defines some type of rotation mechanism 32 as is known in the art. to create a vortex of the liquid product fed from the discharge passage so that the liquid is discharged through the orifice 31 in the form of a fine spray during pumping.

The plunger means comprises a cover 33 comprising an upper end wall 34 having a dependent sleeve 35 in slidable seal engagement with the wall of a duct 36 formed in the head of the plunger coaxial with the discharge passage. Sleeve 35 and duct 36 define a variable volume reverse suction chamber 37.

The means of coverage are changeable axially in relation to the head of the plunger and the pumping piston against the direction of the spring means comprising a first stage spring which may be in the form of a plurality of relatively weak and evenly spaced springs or springs 38. The spring means further comprise a second stage spring which may be in the form of a plurality of springs or springs evenly spaced 39 having a spring force stronger than that spring of the first stage and interdigitated with it for balance of the covering means, as illustrated in Figure 4. In the illustrated example, the dependent spring legs are molded integrally with the wall 34 and the legs 38 support the upper surface 41 of the plunger head in the rest position in Figure 1. The spring means having first and second stage springs may further have the shape of a coil spring in which the spring turns of a section thereof have a spring force greater than the spring turns of an adjacent section, without leaving the invention. And, even other types of spring means having springs or spring sections of first and second stages for carrying out the invention can be provided.

The covering means 33 further comprise an edge 42 dependent from the end wall 34 and surrounding the head of the plunger in telescopic relation. The edge 42 has a portion 43 that covers the discharge orifice in the rest position in Figure 1 and has an opening 44 adjacent the portion 43 to discover the discharge orifice in a manner that will be explained more fully forward. And, an internal projection 45 on portion 43 can be provided to rest against the discharge orifice of Figure 1, as presented in U.S. Patent No. 5,207,785, commonly owned herein.

A vertical rib 46 can be provided on the head of the plunger for receiving within a vertical groove 47 at the edge 42 (see Figure 4 also) to orient the cover means 44 and the discharge orifice. And, a trap (not illustrated) of some kind acting between the cover means 33 and the head of the plunger can be provided to prevent separation of the cover means from its head in the position of Figure 1.

In operation, with the pumping chamber completely filled with product, upon application by the operator of a finger downward force against the end wall 34, the cover means 33 changes downward from its position in Figure 1 to that of Figure 2 against the direction of the spring legs of the first stage 38 to first discover the hole as illustrated. The covering means change from a distance A (Figure 1) set approximately 0.08 inches to a relative distance B (Figure 2), a distance approximately 0.03 inches relative to the head of the plunger. The first stage of the journey from distance A to distance B is effective after the application of an external activation force. The orifice is discovered during the first stage of the trip and the volume of the inverse suction chamber 37 is reduced, although the volume reduction is insufficient to greatly increase the pressure, if at all, above the atmospheric in the sufficient chamber for purging any residual liquid product from the discharge orifice 31 or its turning mechanisms. It is expected that with this initial reduction of the volume of the inverse suction chamber some of the residual product within the conduit 36 will simply be directed towards the vicinity of the most rotating mechanisms without entering the turning mechanism.

The spring force of the legs 38 is designed to facilitate a relative change of the covering means between their positions n Figure 1 and Figure 2 and is designed to transmit the external force applied to the plunger head 27 which causes the piston is reciprocal with its cylinder (Figure 2). During this course of travel, as in any sprinkler with precompression pump, the discharge head valve 23 is lowered together with the piston and with the feed and discharge valve closed, the pressure inside the pump chamber 14 is increased to a threshold pressure near the beginning of the downward stroke of the piston surpasses the force of the return spring of the piston 24. At this threshold pressure the head valve 23 is forced to be reciprocally downward inside its piston cylinder 15 in counter-direction of the piston 13 and its valve seat 22 to open the discharge as illustrated in Figure 3.

For a sprinkler with a common precompression pump, it has been shown that the pressure accumulated in the pump chamber continues to increase beyond the threshold pressure to a maximum pressure during pumping. At or just before reaching the threshold pressure, the spring legs of the spring of the second stage engage the surface 41 of the plunger head. The force of the springs of the second stage are designed so that the pumping pressure that accumulates to the maximum exceeds the force of the springs of the second stage 39 which causes the covering means 33 to change in relation to the head of the plunger the remaining 0.03 inches, as illustrated in Figure 3, after which the volume of the inverse suction chamber is reduced.

Upon restarting the operation of the pump, the covering means 33 travel in relation to the piston head only the first stage while the piston is reciprocal downwards before opening the discharge valve in which the springs of the second stage 39 they are coupled with the upper part of the plunger head. The maximum dynamic pressure reached in the pump chamber exceeds the force of the springs of the second stage, since it is designed for this purpose, so that the coverage means 33 travels the full displacement stroke.

By releasing the applied force externally, the cover means 33 returns to its rest position of Figure 1 during the return stroke of the piston due to the restoring force of the first and second stage springs. The volume of the chamber 37 thus expands which creates a slightly sub-atmospheric pressure therein to draw residual product inwardly in the opposite direction of the discharge orifice and its turning mechanisms. The volume of the inverse suction chamber expands in two stages; a first stage subsequent to that illustrated in Figure 2 and a second stage subsequent to that illustrated in Figure 1 in which the volume of the inverse suction chamber expands completely. This prevents occlusion of the orifice, while the residual liquid committing suicide back is available to be dispensed during the next pressure stroke but without dripping or spilling through the orifice before the pump begins to spray.

According to another example of the invention, the pump sprinkler of Figures 6 to 9, generally designated 48, is similar to the sprinkler with pump 10 in structure and operation except that it eliminates the springs of the first stage and the cover of the orifice .

Instead, a spring loaded plunger head 49 is mounted on the piston rod 19 for a shifting movement relative thereto.

The head has an inner dependent sleeve 51 to which the probe 30 is molded, the sleeve is telescopic around the upper end of the piston rod as illustrated. The spring means, which may be in the form of a chevron spring 52 molded to the sleeve 51, bears against the upper end of the piston rod. A reverse suction chamber 37 is defined below the upper end wall 53 of the plunger head.

The piston rod has a wide, annular and outer groove 54, illustrated in detail in Figure 7 and the lower end of the sleeve 51 has an internal annular number 55 of a width less than that of the groove 54.

In operation, after the pump chamber is filled with liquid product to be sprayed, the application of a finger force external to the terminal wall 53 of the plunger head is transmitted directly to the pump piston 13 by the spring 52 without compressing the resort. The spring has a force strong enough to allow an action force to be applied downwardly against the plunger head without causing any relative change from the plunger head to the plunger at the start of the downward movement of the plunger during the action of the plunger.

As in the first example, the discharge head valve 23 is lowered by means of the pumping piston during the pressure stroke while the piston accumulates the pressure in the closed pump chamber with valve. During the pressure stroke, the pressure in the pump chamber 14 reaches a threshold pressure sufficient to overcome the opposite force of the return spring of the piston 24. At the threshold pressure the head valve changes in the opposite direction of its valve seat 22 to open the download. As the pressure in the pump chamber continues to build up during the pressure stroke to a maximum pressure beyond its threshold level, said maximum pressure exceeds the designed force of the spring 52, there is a relative change between the piston and the head of the pump. I plunge a distance allowed by the width of the groove 54 (see Figure 10), after which the volume of the inverse suction chamber 37 is reduced and the piston is allowed to descend to the bottom of its cylinder while the discharge remains open.

As in the first example, this volume reduction in chamber 32 does not create a sufficient pressure to purge residual product from the discharge orifice and its turning mechanisms, but rather directs the movement of a small amount of product towards the mechanisms rotation. The head changes to close the discharge again when the pressure in the pumping chamber is exceeded by the force of the return spring 24. And, by relaxing the external pressure applied to the head of the plunger, the spring 52 changes the head of the plunger relatively. plunger from its Figure 10 back to its position of Figure 7 which causes the chamber 37 to expand and thus draw inward the residual liquid product from the discharge orifice and its turning mechanisms to thereby prevent occlusion and any restriction in the flow channel that guides the orifice and that could interfere with the performance of 1 sprinkler with pump.

At the end of the suction stroke illustrated in Figure 6, the valve seal 26 of the head is decoupled from the wall of the cylinder 12 for the supply of liquid product in the pumping chamber from the insertion hose due to the negative pressure created in the pumping chamber after the expansion of the camera.

The spring 52 is chosen to have a spring rate that exceeds the pressure of the pumping chamber as it accumulates to its threshold level, but is exceeded by the maximum dynamic pressure reached in the pumping chamber beyond the threshold level.

A chevron spring has been illustrated, although the invention is not limited. It could be replaced with a spring of grinding wheel, blade or the like without leaving the scope of the invention.

From this, it can be seen that an economical and highly effective reverse suction mechanism has been developed for a sprinkler with a finger operated type precompression pump comprising a reverse suction chamber that expands in volume on or after of closing the discharge valve to suck in any residual liquid in the opposite direction of the discharge orifice and its rotation mechanisms, to avoid occlusions that would interfere with the performance of the pump. The growth and reduction of the reverse suction chamber is facilitated by means of cover loaded with spring on the plunger or by a plunger head loaded with spring. The. Reducing the volume of the reverse suction chamber is insufficient to create sufficient pressure to purge residual liquid product through the discharge orifice as in the prior art. Any slight pressure created during volume reduction is expected to direct any residual product only in the direction, but not through the orifice.

The spring force of the second stage of the specimen of FIG. 1 and the spring force of the single stage of FIG. 6 are exceeded, respectively, upon reaching the maximum dynamic pressure in the pump chamber in order to reduce the volume of the chamber. Reverse suction. After relaxing the external force applied against the plunger means, the chamber 37 expands under the action of the restoring force of the plunger spring means to carry out the anti-occlusive operation.

Although a one-piece head valve has been illustrated, a multi-part head of the type presented in Patent Number 4,051,983 is suitable as a discharge valve for the sprinkler of the invention. Also, the precompression pump sprinkler of U.S. Patent No. 4,941,595 having a return spring of the separate head is adaptable to incorporate the inverse suction feature of the invention. The invention can also be incorporated in any pressure accumulation sprinkler according to the aforementioned.

Obviously, many other modifications and variations of the present invention are made possible in light of the foregoing mechanisms. Therefore, it should be understood that within the scope of the claims the invention can be practiced in other ways than those specifically described.

Claims (14)

1. The claims are: 1. A sprinkler with a liquid precompression pump comprising, a pump body having a reciprocating pump piston in a pump cylinder to define a variable volume pump chamber, said piston has a seat of discharge valve and a hollow rod defining a discharge passage controlled by a valve therethrough, a discharge head valve cod to said valve seat in a closed discharge position under the direction of a return spring, plunger means on one end of said rod to be reciprocal to each piston for opening said discharge valve upon reaching the threshold pressure within said pumping chamber, said plunger means includes a spray nozzle for the discharge having an orifice discharge and turning mechanisms in communication with said discharge passage, the improvement in that: said plunger means has a terminal wall its manually loaded spring loaded, axially and independently changing in relation to said piston to define a variable volume reverse suction chamber in said plunger means in open communication with said discharge passage; spring means for spring loading said plunger means, comprising a spring having a predetermined spring force less than the maximum opposite pressure reached in said pumping chamber whose maximum pressure exceeds its threshold pressure during pumping; said terminal wall rotates towards said piston when spring loading said spring in response to said maximum pressure, in order to reduce the volume of said inverse suction chamber; and said terminal wall rotates in the direction of said piston rod in response to the restoring force of said spring during a return stroke of said piston, in order to expand said inverse suction chamber to draw inward any residual product in the opposite direction of said discharge orifice and said turning mechanisms.
2. 2. The pump sprinkler according to claim 1, wherein said plunger means comprises a plunger head containing said nozzle and said pivoting mechanisms and which is fixedly mounted on said end of said plunger and covering means including said plunger. upper end wall, said spring means further comprise a first stage spring of a given spring force sufficient to transmit an external finger force applied from said upper end wall to said plunger head to be reciprocal with said piston, said spring comprises a second stage spring and said predetermined spring force thereof exceeds said given force.
3. 3. The pump sprinkler according to Claim 2, wherein said spring of the first stage at said given spring force responds to said external finger force applied which allows said cover means to rotate towards said plunger head during a first movement. stage before starting the reciprocation of the piston and turning in the opposite direction of said plunger head during said return stroke.
4. 4. The pump sprinkler according to claim 3, wherein said first and second stage springs comprise reciprocating leaf springs with said cover means.
5. 5. The pump sprinkler according to Claim 3, wherein said cover means has a dependent edge surrounding said head, a portion of said edge covers said hole in a rest position of the sprinkler, said edge having an opening adjacent to said sprinkler. edge for alignment with said hole to discover said hole during said first stage movement.
6. 6. The coniferous pump sprinkler of Claim 5, wherein said edge has an integral projection extending within said hole in said rest condition to clean the orifice of any dry liquid accumulated after the rotation of said cover means towards and in opposite direction of said plunger head.
7. 7. The pump sprinkler according to Claim 6, wherein said plunger means comprises only: a plunger head mounted fixedly on said end of said plunger, said plunger head includes said top terminal wall.
8. 8. The pump sprinkler according to Claim 7, wherein said plunger head has a dependent edge which engages said end of said plunger rod for a movement of axial rotation relative thereto.
9. 9. The pump sprinkler according to claim 8, wherein one of said piston rod and said edge has a groove and the other of them has a cooperative projection, said groove being wider in an axial direction compared to said projection to limit the relative rotation of said plunger means.
10. 10. A sprinkler with a liquid precompression pump comprising a pump body having an axially reciprocating pump piston in a pumping cylinder to define a variable volume pumping chamber, said piston having a discharge valve seat and a hollow rod defining a valve controlled fluid discharge passage through which, a discharge head valve contacts said valve seat in a closed discharge position under the direction of a return spring, a head of plunger on one end of said rod to be reciprocal with said piston between the pressure and return strokes, said plunger head has a spray nozzle mounted therein that! it includes a discharge orifice and turning mechanisms in communication with said discharge passage, the improvement in that: the covering means are mounted on said head for movement of axial turns in relation thereto against the direction of the spring means; said cover means defining with said head a reverse volume suction chamber of variable volume in open communication with said discharge passage; said spring means in action between said covering means and said head; said cover means comprise an upper end wall having a dependent edge bordering said head, a portion of said edge covers said hole in a non-use position, said edge has an opening adjacent said edge portion for alignment with said hole to discover said hole in a condition of use; said spring means comprise a first stage spring having a given spring force which allows said cover to rotate from an initial position to a first position towards said head to discover said hole and to reduce the volume of said reverse suction chamber before to initiate a pressure stroke of said piston and to transmit an external finger force applied to said head during said pressure stroke; said spring means comprises a second stage spring having a predetermined spring force harder than said given spring force to allow said cover means to fully rotate from said first position to a second position towards said head to further reduce the volume of said inverse suction chamber upon reaching a maximum pressure in said pumping chamber that exceeds a threshold pressure sufficient to open said discharge valve; and said spring means returning said covering means to said initial position during a return stroke of said piston to expand said inverse suction chamber and create a sub-atmospheric pressure to suck any residual liquid in and in the opposite direction from said discharge orifice and said turning mechanisms.
11. The sprinkler with pump according to Claim 10, wherein said spring means comprises integral leaf springs with said upper end wall.
12. 12. A sprinkler with a liquid precompression pump comprising a pump body having an axially reciprocating pump piston in a pumping cylinder to define a variable volume pumping chambersaid piston has a discharge valve seat and a hollow stem defining a valve controlled fluid discharge passage through which a discharge head valve contacts said valve seat in a low closed discharge position. the direction of a return spring, a plunger head on one end of said rod to be reciprocal with said plunger between the back and forth bumps, said plunger head has a spray nozzle mounted therein including a discharge orifice and turning mechanisms in communication with said discharge passage, the improvement in that: plunger head has a dependent sleeve in contact with said end of said rod and an upper terminal wall defining with said rod a reverse suction chamber of variable volume in open communication with said download passage; said head in contact with said rod for movement of axial rotation in relation thereto against the direction of the spring means; said spring means have a predetermined spring force for transmitting a finger force applied externally to said head while resisting a relative change of said head during said pressure stroke but allowing a relative change next to said head and said rod for reducing the volume of said inverse suction chamber in response to a maximum pressure reached in said pumping chamber exceeding a threshold pressure sufficient to open said discharge valve; and a restoring force of said spring means causes a relative turn apart from said head and said rod during said back stroke to expand the volume of said inverse suction chamber which creates a sub-atmospheric pressure for inward suction of any residual liquid in the direction opposite to said discharge orifice and its turning mechanisms.
13. 13. The pump sprinkler according to claim 12, wherein axially spaced limiting brakes are provided between said head and said rod to limit the relative changes of said head and said rod.
14. 14. The pump sprinkler according to claim 12, wherein said spring comprises a flexible chevron with said head. ABSTRACT OF THE INVENTION A sprinkler with precompression pump has a reverse suction chamber with variable volume in communication with the discharge hole to suck in any residual liquid in the opposite direction of the hole and the rotation mechanisms to avoid occlusions as a result of dry product accumulated, n a copy a cover on the head of the plunger is loaded with springs and thereby defines the inverse suction chamber. In another example, the piston head is loaded with springs on the piston rod, so that in both cases an upper end wall of the inverse suction chamber is changeable in relation to the piston rod independently of the reciprocity of the piston. The directional spring has a spring force that allows a rotation of the end wall to reduce the volume of the reverse suction chamber to a maximum pressure reached in the pump chamber beyond the threshold pressure required to open the discharge valve, in that time the spring is compressed. The restoring force of the spring causes the upper end wall to expand the volume of the reverse suction chamber, only drawings.