Reduce liquid jet pump of flow resistance within communicating pipe
Technical field
The present invention relates to a kind of jet pump, belong to pump housing technical field.
Background technology
Jet pump utilizes a fluid to transmit energy and the vacuum acquirement device of quality, uses and has the current of certain pressure to pass through
Injection stream sprays, and owing to jet water course speed is the highest, is speed energy by pressure energy, makes the low generation of pressure drop of air-breathing district true
Sky, takes away material under atmospheric pressure.Jet pump has that processing and fabricating is simple, it is safe, easy to maintenance to run, effect relatively
The advantage such as good, is suitable for different working environments and requirement, even can directly aspirate high concentration corrosive liquids, it is possible to application
In reducing the aspects such as environmental pollution improves working conditions, there is the advantage that mechanical type, water-ring vacuum pump are incomparable.
But the conveying pipe in jet pump mostly is flexible hose at present, and corrosion resistance is poor, is not suitable under adverse circumstances
Production application.
It addition, ejector is one of critical component in jet pump, mainly it is made up of nozzle, trunnion, anemostat etc..Existing
Ejector generally in venturi tube structure, be working fluid from the coarse to fine, to accelerate working fluid flow velocity, make working fluid exist
The rear side of venturi outlet forms " vacuum " district.It is an object of the invention to increase further the flow velocity of working fluid, thus
The negative pressure making this region of no pressure is lower, improves work efficiency.
Summary of the invention
The invention solves the problems that and technical problem is that: providing a kind of efficient and corrosion resistant jet pump, this jet pump can reduce
The replacement cycle of communicating pipe, thus reduce production cost.
In order to solve above-mentioned technical problem, the technical scheme that the present invention proposes is: a kind of jet pump, including casing, is centrifuged
Pump and ejector, described ejector is arranged on the top of casing, and a upper lateral part of described casing is provided with overflow pipe, described centrifugal pump
Water inlet connect with casing, the outlet of described centrifugal pump connects with ejector;It is straight that described ejector includes being sequentially connected with
Pipe, the draw, trunnion and anemostat, be provided with in described straight tube and insert this straight tube and extend to the nozzle of the draw, described straight tube sets
Have after communicating pipe, described communicating pipe passing casing and be connected with fluid source;Include metal tube described communicating pipe and be covered on metal tube
The ceramic wafer of inwall, is coated with resin glue between described metal tube and ceramic wafer, described inner wall of metal tube is provided with counterbore, described
Ceramic wafer is provided with the ceramics pole that can be inserted into corresponding counterbore, and the side in opposite directions of adjacent ceramic plate is shaped with the slip feather and tongue-and-groove matched;
Described nozzle includes entrance, contraction section and the expansion segment being sequentially connected with, and the described expansion segment bore from contraction section distant place is relatively from receipts
Contracting section bore nearby is bigger.
The improvement of technique scheme is: the cross section of described ceramic wafer is radially gradually to the ladder of contract along metal tube
Shape, is also coated with resin glue between the side of adjacent ceramic plate.
Improving further of technique scheme is: it is protruding that the outer surface of described ceramics pole is provided with uniform graininess.
Improving further of technique scheme is: described slip feather and tongue-and-groove are all in strip and run through the side of ceramic wafer.
Preferably, described expansion segment is the hollow circular-tube of taper.Further, the tapering of described hollow circular-tube is 60-80 degree.
The method of work of described jet pump, including: described communicating pipe connects with fluid source (such as water source), and ejector is at nozzle
Forming region of no pressure on rear side of outlet, fluid flows to region of no pressure under atmospheric pressure, and the fluid sprayed with ejector mixes
Close, then flow out from overflow pipe, thus realize the transmission of fluid.
According to the continuity theorem of fluid, when fluid successively and stably flows through the pipeline that a thickness does not waits,
Owing to the fluid of a part any in pipeline all can not interrupt or extrude, therefore within the same time, flow to arbitrary tangent plane
The quality of fluid and the fluid mass flowed out from another tangent plane be equal.Further accordance with Bernoulli's theorem, fluid is at a pipe
In road during flowing, the local pressure that flow velocity is big is little, and the local pressure that flow velocity is little is big.When surface highlights, flow tube is relatively thin, and flow velocity adds
Hurry up, pressure reduces.
Therefore, when fluid is by specific expansion segment, forming whirlpool at the edge of expansion segment, this whirlpool makes expansion segment go out
Mouth is formed about low-pressure area, and fluid just constantly flows into towards low-pressure area, can obtain the biggest speedup effect.The present invention and Wen
The dilator of tubular construction is compared, and faster, " vacuum " district formed on rear side of expansion segment outlet obtains lower negative pressure to the flow velocity of fluid,
Fluid can be made under the pressure of air to export faster in the anemostat of ejector, thus improve the work effect of jet pump
Rate.
In use, described communicating pipe connects the present invention with fluid source (such as water source), and ejector is shape on rear side of jet expansion
Becoming " vacuum " district, fluid flows to region of no pressure under atmospheric pressure, and mixes with the fluid of ejector ejection, then from
Overflow pipe flows out, thus realizes the transmission of fluid.
Due to the fact that and the ceramic wafer with ceramics pole is uniformly inserted into the metal tube with counterbore, simultaneously metal tube and
It is coated with resin glue between ceramic wafer, therefore adds the laminating ability between metal tube and ceramic wafer, make the connection of the present invention
Pipe is not easy to come off and damage, and improves wear-resisting intensity and service life, it is possible to efficiently reduce the replacement frequency of communicating pipe, from
And reduce production cost.Owing to pottery relatively metal is more resistant to corrosion, thus the present invention is by avoiding metal straight with corrosive fluid
Contact, improves the corrosion resistance of communicating pipe, reduce further the replacement frequency of communicating pipe, thus reduce further life
Produce cost.It addition, the present invention can utilize ceramic wafer smooth surface and the advantage easily manufactured, reduce liquid and flow within communicating pipe
Dynamic resistance, improves and produces efficiency.
Accompanying drawing explanation
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the structural representation of communicating pipe in Fig. 1.
Fig. 3 is the structural representation of ejector in Fig. 1.
Detailed description of the invention
Embodiment
As depicted in figs. 1 and 2, including casing 1, centrifugal pump 3 and ejector 4, ejector 4 is arranged on case to the jet pump of the present embodiment
The top of body 1, a upper lateral part of casing 1 is provided with overflow pipe 5, and the water inlet of centrifugal pump 3 connects with casing 1, the water outlet of centrifugal pump 3
Mouth connects with ejector 4;It is communicated with pipe 6 on ejector 4, is connected with fluid source after communicating pipe 6 passing casing 1;Communicating pipe 6 wraps
Including metal tube 6-1 and be covered on the ceramic wafer 6-2 of metal tube 6-1 inwall, metal tube 6-1 inwall is provided with counterbore, ceramic wafer 6-2
It is provided with the ceramics pole 6-3 that can be inserted into corresponding counterbore, between metal tube 6-1 and ceramic wafer 6-2, is coated with resin glue, adjacent ceramic
The side in opposite directions of plate 6-2 is shaped with the slip feather and tongue-and-groove matched.In the present embodiment, slip feather and tongue-and-groove are all in strip and run through ceramic wafer
Side, resin glue can use epoxide-resin glue.
As it is shown on figure 3, ejector 4 includes straight tube 4-1, draw 4-2, trunnion 4-3 and the expansion being sequentially connected with in the present embodiment
Dissipating pipe 4-4, be provided with and insert this straight tube 4-1 and extend to the nozzle of draw 4-2 in straight tube 4-1, straight tube 4-1 is provided with and fluid source
The communicating pipe 6 connected;Nozzle includes entrance 4-6, contraction section 4-7 and the expansion segment 4-8 being sequentially connected with, and expansion segment 4-8 is from contraction
Section 4-7 bore at a distance is bigger compared with from contraction section 4-7 bore nearby.
In the present embodiment, expansion segment 4-8 is the hollow circular-tube of taper, and the tapering of hollow circular-tube is 70 degree.Certainly hollow circular-tube
Tapering can select the arbitrary value between 60-80 degree.
In the present embodiment, the cross section of ceramic wafer 6-2 is along metal tube 6-1 radially the most gradually trapezoidal to contract, adjacent
Being also coated with resin glue between the side of ceramic wafer 6-2, it is protruding that the outer surface of ceramics pole 6-3 is provided with uniform graininess.Granule
Shape projection can increase ceramic wafer 6-2 and the adhesion of metal tube 6-1, prevents ceramic wafer 6-2 de-from metal tube 6-1 further
Fall.
The present embodiment can also arrange in casing 1 vertical division board 2, overflow pipe 5 and ejector 4 live apart division board 2
Both sides, the water inlet of centrifugal pump 3 and overflow pipe 5 are positioned at the same side of division board 2.Ejector 4 so can be avoided to spray
The water level fluctuation that high-velocity flow causes affects the steady operating of centrifugal pump 3.
The present invention is not limited to the concrete technical scheme described in above-described embodiment, and in addition to the implementation, the present invention also may be used
There to be other embodiments.The technical scheme that all employing equivalents are formed, is the protection domain of application claims.