CN1012337B - Fluid injection system - Google Patents

Abstract

The present invention relates to a fluid injection system comprising a tubular member in a fluid line, a venturi contained within the tubular member, first and second volumes arranged to contain first and second fluids respectively, said first and second volumes being separated by a pressure responsive means , the tubular member on a high pressure side of the venturi being in fluid communication with said first volume, and a metering line extending from the tubular member on a low pressure side of the venturi and being in fluid communication with said second volume, the arrangement being such that, in use a pressure differential is created across the venturi so that the first volume is increased by fluid passing from the fluid line into the first volume and by movement of the pressure responsive means, the second volume is correspondingly decreased by fluid passing therefrom through the conduit into the fluid flowing through the fluid line, wherein bypass conduit means is provided between the high pressure side of the venturi and the line on the low pressure side of the venturi so as to provide an alternate flow of fluid in the line and modify through volumetric displacement the rate of flow of the second fluid.

Description

Fluid injection system

The present invention relates to a kind of being used for the fluid injection system among second kind of fluid of first kind of fluid injection.

United States Patent (USP) 3,556 discloses a kind of venturi principle of utilizing for No. 141 with liquid fertilizer dispensing fluid dispenser apparatus in the flowing water flow from a container.The liquid fertilizer that this device utilizes the pressure of working fluid to force and is contained in the flexible container flows in the described flowing liquid by a metering valve.This device in, the container of contain fluids chemical fertilizer is inverted, promptly opening down, the main fluid that forces liquid fertilizer to flow out from container is transported to the top (or top) of container.The defective of this device is in use when being assembled to container on the dispenser apparatus or taking off from it, tends to cause making the operator to touch liquid fertilizer and by its contamination.

United States Patent (USP) 2,865 discloses a kind of automatics that two kinds of different liquids dosages are mixed of being used for for No. 388.This device is provided with a pressure sensitive switch, this switch to the pressure differential at Venturi tube two ends and the actuating that causes react, thereby control the switch of a magnetic valve.When a kind of delivery fluid (or main fluid) when flowing through pipeline, by pressure sensitive switch magnetic valve is opened, go so that another kind of additive joined in the delivery fluid that flows along pipeline.When not delivering fluid in the pipe and flow, closed electromagnetic valve then.In addition, in the pipeline of delivery fluid, be provided with one in additive stream and be used for controlling the control valve that adds the flow velocity of additive to the delivery fluid.

In above-mentioned one type of prior art syringe, one other fluid that adds in main fluid or additive all are to enter main fluid again through the valve that can control its flow velocity.The shortcoming of this structure is if contain little solid particle in the additive, just to cause obstruction when flowing through valve easily.

The objective of the invention is to propose a kind of being used for the fluid injection system among a kind of fluid injection one other fluid.Wherein between the metering pipeline of the high-pressure side of Venturi tube and Venturi tube low-pressure side, be provided with a bypass manifold, thereby in this pipeline, provide alternative liquid stream and the displacement by volume to change the flow velocity that described one other fluid is flowed into main fluid.

According to a kind of fluid injection system of the present invention, include a pipe fitting that is installed in the fluid circuit and becomes the some of this fluid circuit, fluid flows in pipeline under pressure at work; A Venturi tube that is contained in the described pipe fitting; Formation is used for distinguishing first kind of fluid of splendid attire and first chamber of second kind of fluid and the device of second chamber, described first chamber is empty stretches around described second chamber, described first chamber and second chamber are separated by the presser sensor spare of a stiff flexible pouch form, pipe fitting communicates with first chamber of described device by a pipeline in the high-pressure side of Venturi tube, article one, the extended metering pipeline of low-pressure side from the Venturi tube of the Venturi tube of described pipe fitting communicates with second chamber of described device, this system produces pressure differential in use in the Venturi tube both sides, thereby make fluid enter first chamber and make described presser sensor spare produce displacement and the volume of first chamber is increased through described fluid line, and enter fluid from second chamber through described metering pipeline by described fluid circuit by fluid, the volume of second chamber is correspondingly reduced, the flow rate of fluid that enters described fluid circuit from described second chamber changes according to the rate of flow of fluid the described fluid circuit proportionally, between the metering pipeline of the low-pressure side of the high-pressure side of Venturi tube and Venturi tube, be provided with a bypass conduit, flow into first kind of flow rate of fluid thereby in described pipeline, provide alternative liquid stream and the displacement by volume to change second kind of fluid.

Set forth the present invention with reference to the accompanying drawings by way of example, wherein:

Accompanying drawing 1 is the schematic diagram of first embodiment of fluid injection system of the present invention;

Accompanying drawing 2 is the schematic diagram of second embodiment of fluid injection system of the present invention;

Accompanying drawing 3 is schematic diagrames of a kind of application of Fig. 1 embodiment;

Accompanying drawing 4 is the cutaway view of the isolating valve in accompanying drawing 3 shown devices;

Accompanying drawing 5 is sectional exploded views of the shuttle valve in accompanying drawing 1 or 3 shown devices;

Accompanying drawing 6 is planes of implementing the device of accompanying drawing 1 system;

Accompanying drawing 7 is the cutaway views along 7-7 line in the accompanying drawing 6;

Accompanying drawing 8 is side views of implementing the device of accompanying drawing 2 schemes;

Accompanying drawing 9 is assembling relationship figures of the sealing device of bottleneck in accompanying drawing 8 devices;

Accompanying drawing 10 is parallax stereograms on the part of accompanying drawing 9 device;

Accompanying drawing 11 is stereograms of the spray lance of backpack pump of the present invention;

Accompanying drawing 12 is stereograms of the spray lance connector of accompanying drawing 11;

Accompanying drawing 13 is side views of the connector of accompanying drawing 11, the rigging position of the spring of expression pipe fitting.

Fluid circuit 10 is arranged in accompanying drawing 1, and this fluid circuit 10 is flow through in the fluid effect of being stressed in when work, and pipe fitting 12 tippings are in pipeline 10, and the abutting end on each end of fluid circuit 10 and the pipe fitting 12 is connected in the mode of routine.

Pipe fitting has a Venturi tube 14 for 12 li, when fluid along the direction of arrow 16 during by fluid circuit 10, Venturi tube makes fluid produce a pressure to fall.Pipe fitting 12 also comprises two apertures 18 and 20, and they lay respectively at the high-pressure side and the low-pressure side of Venturi tube.

One first pipeline 22 extends on the pressurized tank 24 from aperture 18, and pressurized tank 24 is rigid structures.

Pressurized tank 24 is a tubular, has the bottom 26 that has upright circumferential side wall 28.26 entered pressurized tank 24 at the bottom of pipeline 22 passed jar.Pressurized tank 24 also comprises a diaphragm bag 30(or claims soft housing, film), its shape is similar to pressurized tank 24, also is tubular.One periphery that turns up is specifically arranged on the top away from the bottom diaphragm bag, this limit is clamped between the sidewall 28 abducent ends and loam cake 32 of pressurized tank 24 with suitable method as the method with bolted, diaphragm bag 30 has the wall of a resilient, available neoprene or rubber, or other any flexible material that can not damaged by fluid is made.First chamber is limited by pressurized tank 24 and diaphragm bag 30, and second chamber is limited by diaphragm bag 30 and loam cake 32.One shuttle valve 34 is housed on loam cake 32, and this shuttle valve is communicated with the inside of pressurized tank 24 by a short tube 36 that leads to loam cake 32, and shuttle valve is also communicated with storage tank 37 by pipe 38, and pipeline 38 feeds the bottom of storage tank 37.Storage tank 37 is provided with ventilative device 39.One metering pipeline 40 is also drawn from shuttle valve 34.At work, when not having main fluid to pass through pipeline 10, shuttle valve makes fluid inject diaphragm bag from storage tank 37 through pipe 38 and 36 under the gravity effect, this expands diaphragm bag, bottom 26 and sidewall 28 expansions to jar 24, therefore second chamber increases, and first chamber reduces accordingly, until diaphragm bag is full of.When fluid flows through pipeline 10 and pipe fitting 12, produce a pressure differential in the Venturi tube both sides.This has stopped supplying with from the fluid of jar 24, and makes fluid enter pressurized tank 24 by pipeline 10 by aperture 18 and pipeline 22 and to exerting pressure on the wall of diaphragm bag 30.Diaphragm bag 30 inwardly shrinks, and second chamber is reduced with the increase of first chamber.Therefore fluid in diaphragm bag is extruded by pipeline 40.Fluid by pipeline 40 enters pipe fitting 12 through aperture 20, and is injected among the liquid stream in the pipeline 10.

Have now found that in the wide range of the rate of flow of fluid in pipeline 10, what the variation of injection speed was approximate changes according to the variation of rate of flow of fluid.Thereby the amount of second kind of fluid being injected in first kind of fluid of per unit volume remains constant basically.Preferably make the minimum flow velocity in the pipeline 10 reach the flow velocity that is enough to produce the pressure differential that drives second fluid.If desired, jars 24 can be designed to oppositely connect, thereby diaphragm bag 30 communicates with pipeline 22, and jar 24 communicates with pipeline 40.In this case, diaphragm bag 30 expands and forces second kind of fluid to be discharged by jar 24.In addition, partition member can replace flexible member to promote first kind and second kind of fluid with piston or other member.

The injection speed that injects second kind of fluid of first kind of fluid can change bypass manifold 50 connecting pipelines 22 and pipeline 40 with bypass manifold 50.Owing to there is bypass manifold 50, make first kind to be that main fluid enters pipeline 40 from pipeline 22, one that becomes second kind of fluid substitutes amount, and its stops or has replaced the second kind of Fluid Volume that promptly adds that enters Venturi tube pro rata.

Bypass manifold 50 can comprise a control valve 52.Control valve 52 has been controlled first kind of flow velocity that is main fluid in 50 li in conduit.When open valve 52 when increasing the flow of first kind of fluid, the flow of second kind of fluid by pipeline 40 will reduce, vice versa.

In case reached the interpolation flow of the design of second kind of fluid, this adds flow and will be kept, and the second kind of fluid that partly is pre-mixed with main fluid will advance Venturi tube 14, mixes with the main flow of main fluid and reaches the ratio of design.Valve 52 can be with pressing the fixedly necking down replacement that design current velocity is demarcated, and necking down can be the plunger that partly limits bypass liquid stream, also can be the multidigit plunger of a plurality of preset flow rate.

This system can also further expand with the adjusting of Venturi tube or necking down and combine, and its purpose is to adjust pressure differential (for a given flow), thereby changes pressure differential range, the closed circuit flow of second fluid line and Bypass Control in this scope.The control method of Venturi tube can adopt mechanical conditioning type to be adjusted in resilient lip-deep opening degree, also can or use addition with first kind of fluid to pump into mode in the hole of Venturi tube with sphincter.This last a kind of method has been used to control the necking down of Venturi tube by invention.

Device shown in the accompanying drawing 1 has purposes widely.For example it can be used for a small amount of fragrance material is added in the low-quality HC fuel to increase its thermal output value as catalyst.Device of the present invention provides the safety method that uses high flammable main fluid.The device of accompanying drawing 1 goes out can be used for to be metered into the interpolation fluid of gaseous state main fluid, for example lubricating oil is added in the compressed air, and this compressed air is pneumatic tool the beche on the rig for example that needing to be used for continuous lubrication.

System shown in accompanying drawing 1 and the accompanying drawing 2 is that the installation of working fluid when being liquid arranged, and to adopt gas be work under the situation of fluid but the present invention can be easy to adapt to.This system can be developed into a plurality of second fluid lines and a plurality of storage chamber and a plurality of bypass controller and is input into one or more Venturi tubes, and a plurality of Venturi tubes are to arrange in the mode of serial or parallel connection.

Device in the accompanying drawing 2 is the remodeling of accompanying drawing 1 device, the identical identical part of reference number representative.

The main distinction of accompanying drawing 2 and accompanying drawing 1 is to have omitted storage tank 37, pipe 36 and 38 and shuttle valve 34.In addition, metering pipeline 40 directly causes aperture 20 by the loam cake 32 that diaphragm bag 30 passes jar 24.

The method of work of the device of its method of work of accompanying drawing 2 shown devices and accompanying drawing 1 is basic identical.

Device shown in the accompanying drawing 2 is envisioned for a device of easily disposing, therefore second kind is promptly added fluid in case after diaphragm bag 30 is all discharged, whole device just goes out of use, and is used in to be full of second kind of new device that promptly adds fluid in its diaphragm bag 30 and to change.The device of accompanying drawing 2 can be used in the same purposes of accompanying drawing 1 device.Yet because it has tractable performance, this device also can be used for other purposes.For example the device of accompanying drawing 2 is particularly suitable for the knapsack type sprayer of spraying herbicide and pesticide, and the active component that spray is stored in 30 li of diaphragm bags with the form of concentrate, and main fluid adopts the water that is stored in portable jar.This diaphragm bag 30 will be designed to the form that the operator needs to contact this active component that concentrates anything but.This diaphragm bag 30 can be incorporated in and comprise accompanying drawing 2 all in the tractable parts of low cost of device, when the diaphragm bag sky after, these parts will go out of use.

Accompanying drawing 3 is depicted as the remodeling of accompanying drawing 1 shown device, so that a solution is supplied to stand-pipe output on a certain height, and for example outlet on about 3 meters or 4 meters height.

Device shown in the accompanying drawing 3 comprises a main-supply road 60, and it is by a main switching valve 62 feedwater pipe fittings 64, and this pipe fitting 64 includes Venturi tube, and its working method is similar to the pipe fitting 12 of accompanying drawing 1.The main-supply road continues to extend certain distance then in the horizontal direction, changes 90 ° then and arrive stand-pipe output 66 after about 3 or 4 meters.

Device shown in the accompanying drawing 3 comprises: the storage tank 68 of a storage concentrate, its particular point is its height that highly is lower than stand-pipe output 66.Device shown in the accompanying drawing 3 also comprises the jar 70 of batching, and it is similar with the jar 24 in the accompanying drawing 1.Batch jars 70 from jar 68 through gravity transfer pipeline 72 by the new concentrate of supply.Pipeline 72 has a shuttle valve 74, and is similar to the shuttle valve 34 of accompanying drawing 1.

Through the upper end of shuttle valve 74 to isolating valve 78, this isolating valve will describe in detail pipeline 72 in the back by above-mentioned jars 70 top, and pipeline 76 enters the low-pressure side of pipe fitting 64 then.

Derive the lower end of a pipeline 80 from the high-pressure side of pipe fitting 64, then to jars 70 bottom to isolating valve 78.In addition, regulate pipeline 82 for one and tell, be connected with pipeline 76 by a control valve 84 from pipeline 80.Valve 52 identical functions of valve 84 execution and accompanying drawing 1.

Above-mentioned isolating valve 78 causes device 86 by a film and handles at working position and do not move between the working position.One side of film actuator 86 links to each other with the main line 60 of valve 62 upstreams by pipeline 88, and opposite side is linked to each other with pipeline 80 by pipeline 90.

This isolating valve also has a normal pressure discharge chamber 92.

Accompanying drawing 3 shown devices are identical with the working method of accompanying drawing 1 device, and water is transfused to main line 60, therefore along pipeline 80 principal pressure put on jar 70.This makes concentrate discharge and arrive along pipeline 76 low-pressure side of pipe fitting 64 from jar 70.By opening or closed control valve 84, can change the flow velocity of concentrate.

Jar 70 can also be used the concentrate fillings again in the fluid reservoir 68, and concentrate is flowed through valve 74 to jar 70 under the gravity effect from jar 68.Yet if decision stops toward outlet 66 feed flows, shut off valve 62 will be full of water from the pipeline 60 of the downstream part of valve 62, and these glassware for drinking waters have certain hydraulic head.Therefore, certain pressure still acts on the jar 70 by pipeline 80, has stoped concentrate to pour in the jar 70 like this.

The problem that above-mentioned prevention pours into jar 70 can be solved by isolating valve 78, and embodiment as shown in Figure 4.Valve 78 comprises a valve body 100 in accompanying drawing 4, it has axially extended cylindrical shrinkage pool 102, there is first port 104 to be used for linking to each other with pipeline 76 from jar 70, second port 106 links to each other with the pipeline 76 that leads to pipe fitting 64, third connectivity mouth 108 links to each other with the pipeline 80 that leads to jar 70, also has four-way mouth 110 to link to each other with the pipeline 80 that attracts from pipe fitting 64.Above-mentioned shrinkage pool 102 containings one are spool 112 in axial sliding, and its action is controlled by film actuator.Spool 112 has one first intermediate cylindrical crowning 114 and one second nose-circle column-shaped projection face 116.

Upper end by visible shrinkage pool 102 in the accompanying drawing 4 is sealed, and a helical spring is arranged between the blind end and spool 112 of shrinkage pool 102.

Under the normal condition, spring pushes away spool 112 down to the position shown in the accompanying drawing 4.When this station, concentrate can flow along pipeline 76 by port 104 and 106, and water can flow to jar 70 along pipeline 80 through port 110 and 108.Above-mentioned crowning 116 separates port 104,106 and port 110,108, and above-mentioned crowning 114 separates port 108,110 and discharge chamber 92 simultaneously.

But if valve 62 is closed, the pressure of valve 62 upstreams will be higher than the pressure of high-order outlet 66.Therefore a pressure differential is arranged between pipeline 88 and 90, this pressure official post film actuator is mentioned spool 112.Position after rising, the cylindrical protrusions face 116 blocking-up ports 104 and 106 of spool 112 cut off port 108 and 110 with cylindrical protrusions face 114.On this position, jar 70 is with isolated from the pressure in the pipeline 60, and the water in the pipeline 80 between jar 70 and isolating valve 78 is discharged from through port 108 and discharge chamber 92.This also discharges and acts on the pressure on jar 70 septation bags and allow the peg or spindle in the valve 74 descend, and concentrate is at gravity effect lower edge pipeline 72 filling diaphragm bag again as a result.

In the present invention a kind of shuttle valve of Ying Yonging as shown in Figure 5, the shuttle valve in the accompanying drawing 5 comprises in addition part 120 and bottom part 122 in addition of a top, they are connected to each other with screw thread.Top part 120 in addition has an endoporus 124, and 124 middle part has a tapering part in the hole, and " O " type sealing ring 128 is housed in this tapering part.One conduit 130 is arranged at bottom part 122 in addition, and conduit 130 has narrow top 132.Bottom part 122 in addition also comprises near the L type duct 134 on it.

Valve shown in the accompanying drawing 5 also has a peg or spindle 136, and it comprises a conical upper 138, and this conical upper inside has one " O " type sealing ring 140.The pipeline 40 of port 134 and accompanying drawing 1 links to each other or links to each other with the pipeline 76 of accompanying drawing 3.When pressure acted on the diaphragm bag in the jar, fluid pressure also can pass through narrow top 132, and the result is transported in the pipe fitting that includes Venturi tube fluid from diaphragm bag.This makes peg or spindle 136 rise and interosculates until tapering part 126 and 138, and forms sealing state by seal 128.Prevented that so new concentrate is imported into the diaphragm bag from fluid reservoir, yet when the pressure that acts on the diaphragm bag 30 has been stopped, peg or spindle 136 descends under the gravity effect, drop to always and be sitting near till on the shoulder 142 of port 134.On this position, 134 sealed 140 of ports seal up, and new concentrate enters diaphragm bag by port 124 and 130 under the gravity effect.

In accompanying drawing 6 and accompanying drawing 7 specific embodiments of pressing the device of accompanying drawing 3, just without the isolating valve in the accompanying drawing 3 78.The part in addition that the digital representative of identical in the drawings reference is identical.Be rigidly connected to by many band steels 150 on the jar 70 at pipe fitting 64 in this system.

In addition, pipeline 76,80 and 82 is connected on the pipe fitting 64 by T type spare 152.Accompanying drawing 6 and 7 shown devices can be used for the insert of straight tube, are used for making the water that flows through this straight tube to be batched with desirable concentration.

Accompanying drawing 8 is a specific embodiments of pressing the device of accompanying drawing 2, the part in addition that identical in the drawings reference number representative is identical.

In accompanying drawing 8, jar 24 is a transparent plastic bottle, and diaphragm bag 30 is polybag or similar article, and bottle is by plastic cap 160 sealings of the mold pressing on the bottleneck.Cap 160 is the permanent seal formula on bottle 24.

Cap 160 comprises that a nose 162 is used to install the hand lever (not shown), and a recessed end 164 is used to install the knapsack (not shown) of a flexible pipe or a known type.The pipe 166 of a porous hangs downwards from cap 160.Pipe 166 is guaranteed to be unfolded at the bag 30 of 24 li in bottle, in use manages 166 also as input pipe.

Cap 160 also has a switch cock 168, has only cock opening the position, and liquid stream be from recessed end when nose flows, chemical agent is discharged from bag 30.Cap 160 comprises that also a chemical agent pours into mouth 170, enters in the bag 30 through its chemical agent.When bag 30 has been filled, inlet 170 is shut nonvolatil.Comprised element all in the accompanying drawing 2 12,14,18,20,22,40,50 and 52 in the cap 160.

Therefore, when water from flexible pipe or knapsack by recessed end 164 when nose 162 passes cap 160, be pressed in the water at the concentrate of 30 li in bag, required uniform concentration is by the valve position decision of valve 52.In this embodiment, valve 52 can permanently be placed on specific required valve position, also can expect in some applications, and valve 52 can have for example two valves, and their available one manual switchgears obtain.

A kind of special bottleneck structure that is used on installing in the accompanying drawing 8 is shown in accompanying drawing 9.In the case, bag 30 usefulness one " O " type rings 179 and pipe 166 sealings.In addition, bottle stopper 182 with extension 166 is placed on the bottleneck 180 and seals a bottle, and seals up with bottle 24.Outside bottleneck 180 and assembly parts, the opening of bag 30 seals with input pipe 166 with " O " type ring 179 or other seal with increasing back sealing ring 186.So as long as input port 170-sealing, concentrate just can not overflow, unless bottle 24 breaks.In this connection, bottle 24 can be made with impact-resistant plastic material.The transparency of bottle can directly be observed the amount retained of chemical agent in the bag 30 simultaneously.Simultaneously, be the pipeline 40 of batching shown in the accompanying drawing 9, and bypass manifold 50 or valve 52 can be seen clearlyer in accompanying drawing 10.Thereby bypass manifold 50 and valve 52 are used to replace the batch speed of concentrate change from pipeline 40.Control valve 52 can replace with special plunger, and fluid is mobile in this plunger restriction bypass manifold 50, makes it reach the speed that will control.

In accompanying drawing 11, the spray lance 190 of a knapsack is shown, spray lance has connector 192, and the enlarged drawing of connector is seen accompanying drawing 12.Spray lance 190 also comprises a bar 194 that assembles mutually with connector.

Connector 192 has the first female end pipe 196 and the second male end pipe 198.Pipe 196 assembles with the outer end elements and the inner element of spray lance 194 respectively mutually with 198. Pipe 196 and 198 usefulness arched members 200 are rigidly connected.Under arched member 200, the existence one of pipe 196 and 198 at interval like this.

In addition, as shown in Figure 13, the pipe 198 be elasticity movably, it by helical spring 202 bullets to a resting position.

The cap 160 of accompanying drawing 9 shown devices can match with pipe 196 and 198, press to spring 202 and widen the interval of pipe between 196 and 198 by managing 198, then cap 160 is inserted this at interval, loosen pipe 198 afterwards, pipe 198 is tightly connected with recessed end 164 like this, and pipe 196 is tightly connected with nose 162.Use the method, the bottle 24 of accompanying drawing 8 can be easily clamped in the spray lance of a knapsack or flexible pipe and used concentrate always to drain, and at this moment, removes bottle 24 and changes it with new bottle by the process opposite with said method.

Doing conspicuous technical change or modification is considered to be within the scope of the invention.For example in the embodiment of accompanying drawing 9, have a spring and foraminate part, stopper 170 can be used to the effect of " petcock ".Unless promptly stopper 170 is depressed, otherwise stopper 170 will rise the liquid stream that cuts off in the concentrated fluid hose 166.

In addition, Venturi tube can be the form of a reverse Venturi tube, and in this Venturi tube, firm element is placed in the middle receipts of pipe or housing to form a necking down.

Claims (8)

1, a kind of fluid injection system includes a pipe fitting that is installed in the fluid circuit and becomes the some of this fluid circuit, and fluid flows in pipeline under pressure at work; A Venturi tube that is contained in the described pipe fitting; Formation is used for distinguishing first kind of fluid of splendid attire and first chamber of second kind of fluid and the device of second chamber, described first chamber is empty stretches around described second chamber, described first chamber and second chamber are separated by the presser sensor spare of a stiff flexible pouch form, pipe fitting communicates with first chamber of described device by a pipeline in the high-pressure side of Venturi tube, article one, the extended metering pipeline of low-pressure side from the Venturi tube of described pipe fitting communicates with second chamber of described device, this system produces pressure differential in use in the Venturi tube both sides, thereby make fluid enter first chamber and make described presser sensor spare produce displacement and the volume of first chamber is increased through described fluid line, and enter fluid from second chamber through described metering pipeline by described fluid circuit by fluid, the volume of second chamber is correspondingly reduced, the flow rate of fluid that enters described fluid circuit from described second chamber changes according to the rate of flow of fluid the described fluid circuit proportionally, it is characterized in that between the metering pipeline of the low-pressure side of the high-pressure side of Venturi tube and Venturi tube, being provided with a bypass conduit, flow into first kind of flow rate of fluid thereby in described pipeline, provide alternative liquid stream and the displacement by volume to change second kind of fluid.

2, fluid injection system according to claim 1 is characterized in that described bypass manifold comprises a control valve that is used for regulating the bypass fluid flow.

3, fluid injection system according to claim 1 and 2 is characterized in that this system also includes the storage tank of above-mentioned second a kind of fluid of splendid attire, and this storage tank is connected with described second chamber by the supply line that contains a shuttle valve; When spraying system was worked, shuttle valve cut off supply line, and when spraying system was not worked, shuttle valve was connected supply line, therefore replenished second kind of fluid to second chamber under the gravity effect.

4, fluid injection system according to claim 1 is characterized in that described bypass manifold disposes multidigit plunger or the necking down that is used to change the bypass fluid flow.

5, a kind of fluid injection system includes a pipe fitting that is installed in the fluid circuit and becomes the some of this fluid circuit, and fluid flows in pipeline under pressure at work; A Venturi tube that is contained in the described pipe fitting; Formation is used for distinguishing first kind of fluid of splendid attire and first chamber of second kind of fluid and the device of second chamber, described first chamber is empty stretches around described second chamber, described first chamber and second chamber are separated by the presser sensor spare of a stiff flexible pouch form, pipe fitting communicates with first chamber of described device by a pipeline in the high-pressure side of Venturi tube, article one, the extended metering pipeline of low-pressure side from the Venturi tube of described pipe fitting communicates with second chamber of described device, this system produces pressure differential in use in the Venturi tube both sides, thereby make fluid enter first chamber and make described presser sensor spare produce displacement and the volume of first chamber is increased through described fluid line, and enter fluid from second chamber through described metering pipeline by described fluid circuit by fluid, the volume of second chamber is correspondingly reduced, the flow rate of fluid that enters described fluid circuit from described second chamber changes according to the rate of flow of fluid the described fluid circuit proportionally, it is characterized in that between the metering pipeline of the low-pressure side of the high-pressure side of Venturi tube and Venturi tube, being provided with a bypass conduit, thereby in described pipeline, provide alternative liquid stream and the displacement by volume to change the flow velocity that second kind of fluid flows into first fluid; And first kind of fluid that described spraying system is configured to contain second kind of fluid is supplied to a location point that has raise, and this spraying system comprises that promising fluid circuit provides the feedway of pressure fluid; Be provided with the switch valve that is positioned at the Venturi tube upstream in this device; An isolating valve when isolating valve cuts out separates first and second chambers and fluid circuit; And be used for the metering pipeline between second chamber and the isolating valve is sealed; This isolating valve has a discharge chamber, and when isolating valve cut out, the fluid of first chamber can be discharged from discharge chamber.

6, fluid injection system according to claim 5 is characterized in that also including one and opens or close the actuator of isolating valve according to the variation of the pressure differential of the switch valve both sides in the described fluid circuit.

7, a kind of fluid injection system includes a pipe fitting that is installed in the fluid circuit and becomes the some of this fluid circuit, and fluid flows in pipeline under pressure at work; A Venturi tube that is contained in the described pipe fitting; Formation is used for distinguishing first kind of fluid of splendid attire and first chamber of second kind of fluid and the device of second chamber, described first chamber is empty stretches around described second chamber, described first chamber and second chamber are separated by the presser sensor spare of a stiff flexible pouch form, pipe fitting communicates with first chamber of described device by a pipeline in the high-pressure side of Venturi tube, article one, the extended metering pipeline of low-pressure side from the Venturi tube of described pipe fitting communicates with second chamber of described device, this system produces pressure differential in use in the Venturi tube both sides, thereby make fluid enter first chamber and make described presser sensor spare produce displacement and the volume of first chamber is increased through described fluid line, and enter fluid from second chamber through described metering pipeline by described fluid circuit by fluid, the volume of second chamber is correspondingly reduced, the flow rate of fluid that enters described fluid circuit from described second chamber changes according to the rate of flow of fluid the described fluid circuit, it is characterized in that between the metering pipeline of the low-pressure side of the high-pressure side of Venturi tube and Venturi tube, being provided with a bypass conduit, thereby in described pipeline, provide alternative liquid stream and the displacement by volume to change second kind of fluid and flow into first kind of flow rate of fluid, and this spraying system is not have the tractable sealing device that can replenish the storage tank of second kind of fluid again, and when second kind of fluid uses up, can go out of use.

8, fluid injection system according to claim 7, it is characterized in that described second chamber is limited by a bottle, and first chamber is to be limited by a bag that is contained in this bottle, this bottle has a closure member, this closure member has counterpart so that Venturi tube is embedded in the fluid circuit, the spray lance of this fluid circuit such as backpack pump or flexible pipe.

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