CN1652864A - Eductor - Google Patents

Abstract

An eductor apparatus (1) having an air gap (2) and a venturi (3), a bypass channel (8) and a spray protection device (10) in the form of a deformable porous body to prevent splash back produced at the inlet to the venturi from escaping through the air gap (2). The spray protection device (10) may also function to absorb the energy of a misaligned water jet and provide an emergency flow path.

Description

Injector

Technical field of the present invention

The present invention relates to a kind of injector that is used for mixing material, for example, concentrate is mixed to meet the requirements of concentration with water.

Background technology of the present invention

Often use injector in the industrial production, for example, hotel or food-processing industry.Some Clean-chemicals are normally sold with the concentrate packaged, need it be diluted to suitable concentration according to predetermined ratio in use.The dosimeter that dilutes concentrate in proportion can be diluted to concentrate the concentration of requirement, and can distribute the dilution that mixes solution.

This instrument has venturi apparatus usually, is exactly usually said injector, can realize reaching the purpose of dilution in the concentrate inspiration current.

Current by a passage, can be devoted to the purpose that in current reach dilution at the concentrated solution that broadens of passage with fast speed very in injector.

These solution majorities are that water is made diluent.Water is carried into by feed pipe, guarantees that it is very important that current are not subjected to the pollution of solution, and injector generally all has a air gap can prevent that chemicals is back in the feed pipe.

Typical the air gap formula injector is a vertical stratification.For example, current spray downwards straight, pass the Venturi tube that the air gap arrives the discharging concentrated liquid.In general injector all has a shower nozzle, and that can concentrate is ejected into the Venturi tube of water below being installed in the air gap in the air gap below the shower nozzle.The top of Venturi tube has an inlet to be used for accepting injection water.Not every water by the nozzle ejection all can enter into Venturi tube, because the inlet of Venturi tube is littler than shower nozzle.For example, if the venturi inlet diameter that the diameter of nozzle is 2-4mm to match so with it then for 1.5-1.8mm.Can guarantee that like this current that arrive in the Venturi tube have enough pressure.The current that can not directly enter in the Venturi tube will produce a frictional force.These unnecessary water must begin from the Venturi tube top just to be gathered together and directly flow out Venturi tube by outlet.Most injectors all have a next door path, and unnecessary water can be entered Venturi tube and converged in the exit with most of current by this passage.For example: the next door path generally is that the outer wall by the inwall of outside discharge pipe and Venturi tube surrounds.

Existing injector has several shortcomings.By the water of top, the air gap nozzle ejection, speed is very high generally speaking, could guarantee that like this current that arrive the venturi inlet place have enough speed.So, be subjected to hindering that not enter the frictional force that produces between Venturi tube current and Venturi tube upper surface be sizable.Can produce a large amount of water that splashes on the Venturi tube upper surface, these water that splash can directly be got back in the air gap.Such phenomenon is harmful to, because in general the air gap is an open structure, so the water of getting back to the inside, the air gap can arrive on the outer surface or near the surface the air gap of injector.If untimely cleaning, these liquid will cause multiplying of microorganism or form hard incrustation scale.Water around injector is a potential danger for injector.Serious words can cause liquid stream to ooze out injector.

Some injectors have been equipped with the equipment that prevents to produce at the venturi inlet place splash.Just describe a air gap formula injector among the patent WO94/14857, had a porose hard disc in center that is installed in the Venturi tube top.

A kind of anti-splash device that is installed in the venturi inlet top has been described among the patent US5522419.This anti-splash device has from the outward extending hypotenuse of bottom, the air gap beginning, can partly cover venturi inlet.

Described the rib-shaped structure that is installed in the venturi inlet top among the patent US5839474, obvious this rib-shaped structure can play anti-splash effect.

Described a kind of injector among the patent US5862829, this kind injector is equipped with the not protective cover of adhesive surface that has that is installed on Venturi tube conical entrance top.This protective cover is a frusto-pyramidal configurations.

Described a kind of watertight construction among the patent US5873725, this watertight construction comprises aperture and depression on the hermetically-sealed construction lower surface that current can pass through.But this device may cause the generation of splash, and the osculum of Venturi tube top can guide the water that splashes to pass through Venturi tube.

More than be exactly that existing transformation the air gap injector reaches the method that minimizing enters splash liquid in the air gap.But existing improvement also exists owing to transform the extra problem of bringing, and these problems can limit the operating accuracy of the injector that above anti-splash device has been installed.

In use, the direction of injection water can be offset, for example the obstruction of shower nozzle.The current that spray from nozzle generally are heated to about 60 degrees centigrade, so the solid that is dissolved in the water may precipitate because water temperature raises.For example, the precipitation of lime.Dust and other precipitation can accumulate in the nozzle when injector was idle.The air gap injector just needs often cleaning like this, guarantees its operate as normal.

General introduction of the present invention

The present invention mainly deal with problems for: the nozzle that direction departs from can not be directly with water from the direct spirt Venturi tube that enters the mouth, also may eject water on the sidewall of Venturi tube import.Cause the problem of splash aggravation.Describe among patent WO94/04857 and the patent US5522419, the injector of the splash guard of small sircle hole is arranged in the middle of having, if nozzle takes place crooked then problem splash will be more serious.

The further problem that the present invention solves.Especially under the situation that nozzle is subjected to displacement, Venturi tube may not have enough abilities to handle owing to the formed big water gaging of high-velocity flow, and its bypass duct that has can be directed to extra water the outlet of Venturi tube from the upper surface of Venturi tube.It is minimum that the volume of in most cases all wishing injector can reach, so simply provide one to have heavy in section bypass channel and may not realize.

The next door path has been set up a direct current space between Venturi tube and outside discharge pipe, the inventor finds can to occur the backfill and the current setback of current at current during at a high speed by outer discharge pipe along outer discharge inside pipe wall.This makes current be blocked in venturi inlet, the degree that the working condition that this phenomenon can influence injector also can the increased water flow splash.The backfill phenomenon of current can cause water by coming out in the air gap, and according to reason recited above, this is very disadvantageous.

This patent has further been confirmed a problem, the working condition of injector under the situation that injector outlet is blocked, this situation be because solid matter or chemical precipitation accumulate in the exit causes, or since the chance obstruction that in passing away, takes place cause.For example, discharge line curls or distortion.The obstruction of passing away in use can make the pressure of injector interior liquid increase.Increased pressure can make liquid discharge injector by the air gap.But, if in the middle of the air gap, provide fluid passage to meet the demands, for example: have only an aperture the Venturi tube part is separated with the air gap at Venturi tube.The fluid pressure of injector interior is increased.Finally, will cause leaking of the breaking of injector, water and concentrate.The inventor also recognizes needs the connection Venturi tube that uses of design and the emergent fluid passage of the air gap when the injector outlet takes place to stop up.The present invention be directed to the improvement that the part-structure that may cause the generation of problem discussed above carries out.The leakage of splash amount and water takes place how to reduce under skew and the injector outlet blocked state in the problem that the present invention mainly solves for the reflux problem of injector under the existing mechanism, at normal operation, nozzle.

Target of the present invention is to prevent liquid splash and back-filled while of water, also will be in injection water crooked and outlet solve the safety problem of injector when stopping up.

Therefore, at first the present invention is a air gap formula injector, has a air gap, and Venturi tube that is installed in the air gap below and one are installed in and are preferably hard porous infiltration structure anti-splash device between the air gap and the venturi inlet.

Here the porous infiltration structure of using is exactly inner porous, prevents what direct current from passing through.For example, through some inner little spaces that links to each other.The porous seepage material of using in the present invention is foamed artificial, woven fabric and non-woven fabric.

The anti-splash structure of this porous has a high surf zone, and the water that is reflected back by the venturi inlet place will be blocked and concentrated here.Porous is particularly conducive to and stops the small water droplet that is reflected back by the venturi inlet place.Because the position relation that the anti-low-priced device of porous infiltration is placed, it can also be used for stopping and assembling the drop that is reflected back by bypass duct.

Using hard porous anti-splash structure further advantages is exactly to disperse the energy of current in the current deflection safely and effectively.In the time of above a branch of injection water is sprayed onto hard porous anti-splash structure, the non-deformable of hard porous anti-splash structure can absorb the most of energy of the current that are ejected into anti-low-priced apparatus surface.

The porous of this kind structure also has the another one advantage, in the time of the current deflection of spraying, when current can be sprayed onto its surface with very high speed, it can make splash reach minimum and can fast current be discharged to below.

It is exactly can form a urgent return flow path in the inside of hard porous anti-splash structure when stopping up when the outlet of injector that this form of the present invention also has an advantage.The porosity characteristic of hard porous anti-splash structure can make when Venturi tube partly produces excessive pressure and reflux by it.Changing a kind of saying is exactly can make liquid stream turn back to the air gap by the venturi inlet place when this porous anti-splash device behind the excessive pressure of the inner generation of Venturi tube.In addition, when having water to spray down in the above, this porous anti-splash device also can be discharged the water of big pressure easily.This porous anti-splash device has a centre bore, and under the normal condition, injection water can enter Venturi tube by this centre bore, and anti-splash device is a disc structure, and the centre bore size can be selected according to different injector nozzle sizes, and centre bore is larger than nozzle.To be exactly current arrive the unique passage of injector inlet by the air gap to optimum state is exactly by the anti-splash device centre bore.Can prevent the generation of splash like this, the generation that fine droplet splashes in the time of especially can preventing to use.

This anti-splash device be movably or available other anti-splash device substitute realize that the user is to the best applications of injector with to the cleaning of anti-splash device.

The present invention has an outside discharge pipe, is installed in the inlet that outer and its upper edge of Venturi tube is higher than Venturi tube.The porous anti-splash device will be installed in outside discharge pipe the inside, the top of venturi inlet.In general the shape of outside discharge pipe and porous anti-splash device is cylindrical, and both can be combined closely.This combining closely can stop splash to arrive the air gap.

The size of this anti-splash device should be selected according to the size of the injector of its application.Generally speaking, the width of anti-splash device, for example, the air line distance of vertical water injection direction should not surpass 100mm, and optimal cases is for being no more than 40mm.Anti-splash device thickness for example, in the distance of water (flow) direction, can be selected according to the size of other device in the injector.The decisive factor of another one decision anti-splash device thickness is the material of anti-splash device, if void density is low, its thickness will be big.On the contrary, if its void density is big, then very thinly just can reach the purpose that prevents splash, when the liquid that especially splashes is vaporific.Preferred anti-splash device thickness is less than 50mm, had better not surpass 20mm.

Second kind of form of the present invention be, a kind of injector comprises the air gap, a nozzle above the air gap, and a venturi apparatus is made up of Venturi tube and place, inlet region.Also has one above Venturi tube and be installed in the porch anti-splash device.This anti-splash device has a centre bore can make injection water flow directly into the inlet region by nozzle.Also have at least two vertical splash protection members, form an additional crooked return flow line with respect to center channel.

Because this structure does not provide a direct passage in Venturi tube and the air gap except center channel, so can prevent the generation of splash.This curved pathway can be under the situation that injector outlet is blocked for Venturi tube in the excessive current of pressure an emergency access is provided.This antispraying structure comprises two splash protection members that are separated at least.One last, and one each branch blocks the passage of a part of inlet region at least down, has at vertical direction between the splash protection members of certain distance to have formed a bending channel, whole porch path removed the center channel part block fully.

Splash protection members stops the direct flow of current in Venturi tube and the air gap as the labyrinth that is installed in the porch.

Anti-splash device can comprise the splash protection members more than 3 or 3, in vertical direction certain distance is arranged between each branch.

Anti-splash device may contain overlapping splash protection members, and these splash protection members can further reduce the liquid that splashes and be back in the injector.

This anti-splash device be movably or available other anti-splash device substitute realize that the user is to the best applications of injector with to the cleaning of anti-splash device.

The third form of the present invention is: a kind of injector includes a air gap, the venturi tube structure with outlet and inlet.At least one next door path leads to outlet by the inlet of Venturi tube, and also opens wide towards the air gap, and the facet of an inclination of inwardly being stretched out by the outside tube wall of next door path can be used for making current to flow down along the outer wall of next door path.

This structure can help next door path outer wall backfill current can not enter into the air gap, and make these current along the outer wall of next door path to dirty.This structure can also help to stop the backfill current by producing when injection water enters Venturi tube.

In addition, this structure can also help to be blocked in the current that splash in the path of next door.

The lower surface of this anti-splash device may be a level, for example perpendicular to the water (flow) direction in the path of next door.If but lower surface tilts, can have more advantage.The angle that tilts will be determined according to the structure of Venturi tube and next door path.But general and water (flow) direction is about 45.

It for example is an annular movably that this device may be one, can be inserted in the path of next door, and be in the top of Venturi tube.

Another form of the present invention is: a kind of the air gap formula injector, include a venturi tube structure and a next door path, and next door path inwall has many grooves along water (flow) direction.

An advantage of this structure is exactly to reduce the capacity of returns of current under geometry that does not change injector and outer discharge pipe and big or small situation.For example, needn't increase the size of next door path.This trench structure can increase the adhesive force between next door path and the current, can make current in the process that flows downward away from outer surface, so just can guarantee current directly outflow in the path aside.Thereby increased the operating efficiency of next door path.As top described, this device is with making current prevent the backflow that sealing produces in the path aside away from the method for next door path outer wall.

Further advantages are exactly because the turbulent flow aside in the path has reduced, and produce current by turbulent flow and collapse to spatter also and just reduce thereupon.The surface area that has a next door path inner surface of groove compare with the inside surface area that does not have groove to increase a lot.Groove on the path inner surface of next door has the certain width and the degree of depth.When flowing through such grooved surface, current can be attracted by groove surfaces owing to the surface tension of water.

A preference: the inside and outside wall of a next door path is made up of the inwall of the outer wall of Venturi tube and outer discharge pipe respectively, and under this structure, groove is on the outer wall of Venturi tube, from top to bottom along the firm part distribution of the outer wall of Venturi tube.

The preference of each form of the present invention all is applicable to other each forms, and each concrete form of the present invention all can use separately or cooperate the work safety that is used for preventing the splash of current and guarantees injector with other forms.

The simple description of diagrammatic sketch of the present invention

The present invention is described further below in conjunction with the drawings and specific embodiments:

Figure 1A is the cutaway view of first kind of form of the present invention;

Figure 1B is the antispraying structure zoomed-in view of Figure 1A;

Fig. 2 A is the cutaway view of form among the present invention second;

Fig. 2 B is for being the antispraying structure zoomed-in view of Fig. 2 A;

Fig. 3 A is the cutaway view of the third form of the present invention;

Fig. 3 B is for being the antispraying structure zoomed-in view of Fig. 3 A;

Fig. 4 A is the cutaway view of the 4th kind of form of the present invention;

Fig. 4 B is for being the antispraying structure vertical cross section of Fig. 4 A;

Fig. 4 C is for being the antispraying structure zoomed-in view of Fig. 4 A;

Fig. 5 A is the cutaway view of another form of the present invention;

Fig. 5 B is for being the antispraying structure zoomed-in view of Fig. 5 A.

The specific embodiment of the present invention

Shown the emitter construction of mainly making from Fig. 1 to Fig. 5 by cast-molding material.Each view all is the cutaway view of the axial plane that begun by center line plane.The air gap 2 is by the cylindrical tube 1 of an open lower end, on it, there is a space 1a to be used for installing the nozzle (not shown), nozzle can spray current (not shown) vertically downward, and the form of nozzle is used in everyday, so not shown in the drawings.

2 bottom is a discharge pipe 4 with venturi tube structure 3 in the air gap, Venturi tube is severed discharge pipe by intermediate section, form two next door paths 8 (can only see in the drawings next door path), the next door path by the inwall of the outer wall of Venturi tube 3 and discharge pipe 4 around forming.The Venturi tube part is by the inlet 6 in the middle of Venturi tube 3 cutter shape upper surfaces, and the direction discharge pipe is open under plane of inlet.The Venturi tube internal structure is well-knownly just not to be described in detail here again.

Chamber, limit 5 in the venturi tube structure is the passages that are used for carrying the liquid that will be diluted by current.In its lower end, link to each other with the discharge pipe 8 of Venturi tube 3.

The specific embodiment of the injector of introducing in Figure 1A and 1B 1 comprises a disc-shaped structure, and by the anti-splash device 10 that the porous plastic foam material is made, anti-splash device is installed in the discharge pipe 4, above venturi inlet 6.Anti-splash device 4 has a centre bore 11, in use can allow injection water pass through.Generally speaking, injection water by the air gap 2, enters venturi inlet 6 by anti-splash device 10 centre bores 11 vertically downward.The chemicals that concentrates in Venturi tube is by side inlet 5 ingoing streams, and the solution after the dilution is by venturi outlet 7 outflow jets.

The diameter of the centre bore 11 of anti-splash device 10 is bigger than the diameter of injection water.Anti-splash device 10 can stop the splash water flow that produces at inlet 6 places and enter the air gap 2.The porous of anti-splash device can well be with the current that reflect back, and especially tiny water smoke stops and accumulates in the discharge pipe 4.

As described above, anti-splash device 10 can allow the current that reflux enter the air gap by discharge pipe 8 or Venturi tube 3 when the pressure of current is very big.Can avoid excessive pressure to produce like this.The porous of anti-splash device and non-deformable can be with the splash minimums when injection water is crooked.

Fig. 2 A and 2B have shown an embodiment, and anti-splash device is by one 3 semicircle plane 22a of branch that are separated at vertical direction, the casting structure of 22b to be arranged.Above visible two 22a of branch, 22b are levels, extend to two rightabouts from a flat board vertical in discharge pipe 4 23, the 3rd branch fails to show in the drawings, its position be anti-splash device below, shape is identical with top two visible branches, also is to be extended outward by vertical flat board 23.These three branches, or be called baffle plate, can see that in plane it is shaped as semicircle, discharge pipe is blocked by anti-splash device completely except the position of centre bore 21 from the outer wall to the center.Centre bore 21 is the air gap 2 and Venturi tube 3 middle unique direct water stream channels.

In use, the drop that is reflected back by venturi inlet 6 is assembled by the branch of below, and indirect discharge pipe 8 that it is entered, and enters the air gap 2 to prevent it.

Three liquid that branch into backflow of above-described anti-splash device 20 have formed one by complications or the crooked path of anti-splash device below to the air gap.This path and direct path 21 have same central shaft.The path of this complications can make the current that return pass through, but can reduce their pressure.

Fig. 3 A and 3B illustrate an alternative embodiment of the invention, and here the anti-splash device of Shi Yonging is, the horizontal baffle 30 in discharge pipe above two discharge pipes 8.30 inwalls 32 by discharge pipe 4 inwardly stretch out, but do not reach discharge pipe central plane place, and it act as and stops by in the liquid arrival the air gap 2 of refluxing in the discharge pipe 4 next door paths 8.In this embodiment baffle plate 30 can be when casting excretory duct outer wall casting simultaneously.

Fig. 4 A, 4B and 4C have described the embodiment further than Fig. 3, are installed in the injector discharge pipe 4 splash-guard ring that movably has outstanding outer 40 above venturi inlet 6.Splash-guard ring 40 is made up of a cylinder 42 and an outstanding upper edge 46 that has inclined-plane lower limb 44.Bottom surface 44 is above the upper surface of Venturi tube, and is downward-sloping to the center by the outer wall of discharge pipe 4.

In use, the effect of the lower surface 44 of inclination is can make by discharge pipe 4 centers or downward withdrawing fluid to change direction.Stop those current to enter the air gap or reduce to reflux the overslaugh of injection water.

Fig. 5 A and 5B show in detail various embodiments of the invention all needs to use various piece, and Venturi tube wherein has 9 parallel vertical grooves 50, is extended to the bottom of Venturi tube by the lower edge 52 of its upper surface.These grooves are very thin very shallow, and towards next door path 8, their effect is to be increased in this surface to go up current (up or down) amount, can reduce the probability that backflow takes place on discharge pipe 4 inwalls.Also just reduced the chance of backfill current arrival the air gap.

Claims (13)

1. the air gap injector, comprise the air gap (2), be installed in the Venturi tube (3) below the air gap and be installed in the air gap and venturi inlet (6) between porous anti-splash device (10).

2. the air gap according to claim 1, porous anti-splash device wherein comprises center hole.

3. according to claim 1 or the described the air gap of claim 2 injector, porous anti-splash device wherein is a disc.

4. according to the described the air gap of above any one claim injector, wherein the material of porous anti-splash device use is non deformable.

5. according to the described the air gap of above any one claim injector, porous anti-splash device wherein is movably.

6. a air gap injector (1), comprise the air gap (2), nozzle above the air gap, by an inlet device and the Venturi tube part (3) that Venturi tube is formed, and be installed in anti-splash device (20) in the described inlet region of described Venturi tube top, wherein anti-splash device comprises that central passage (21) is to allow to be arrived by the current of nozzle ejection the direct path in venturi inlet district, the splashproof element (22a of at least two vertical branches, 22b) be arranged to form one from the anti-splash device below to the air gap and arrive the passage of the complications counter-rotating of described central passage.

7. according to the described the air gap of claim 6 injector, anti-splash device wherein comprises 3 mutually perpendicular branch splashproof elements, and a middle splashproof element (22b) laterally is interspersed with two branches up and down, to limit described tortuous passageway.

8. according to claim 6 and the described the air gap of claim 7 injector, wherein each splashproof element is the semicircle dish type, has axial breach to limit described central passage.

9. injector comprises the air gap (2), has the venturi tube structure (3) of inlet (6) and outlet, has one at least by the next door path (8) that enters the mouth outlet and open to the air gap, and unsteady flow element (30; 40), be positioned at path inside, next door, and from the side the outer wall of path inwardly stretch out and in the face of downwards to depart from the current of the outer wall top that flows to bypass.

10. the air gap according to claim 9 injector, wherein anti-splash device (40) is movably.

11. according to claim 9 and the described the air gap of claim 10 injector, unsteady flow element (30) comprises with the next door path being the flange of one.

12. according to claim 9 any one described the air gap injector to claim 11, wherein the lower surface of bias current element (44) is downward-sloping by the outer wall of bypass.

13. a air gap injector (1), comprise venturi tube structure (3) and be used for making the current bypass flow cross Venturi tube next door path (8), wherein the inner surface of next door path comprises in a large number the grooves along the interval that water (flow) direction is extended.

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