CN220435032U - Jet pump - Google Patents

Abstract

The jet pump of the utility model is provided with a high-pressure spray pipe, a suction pipe, an impeller, a mixing cavity and a jet orifice in sequence from back to front on a tubular passage in the inner cavity of the pump body, and the high-pressure spray pipe is opposite to the impeller. When the high-pressure fluid works, the high-pressure fluid flows through the impeller to drive the impeller to rotate, negative pressure is generated by the rotation of the impeller, low-pressure liquid at the periphery of the high-pressure spray pipe is sucked and accelerated, the low-pressure liquid and the high-pressure fluid enter the mixing cavity together, kinetic energy and momentum are further exchanged, and the low-pressure liquid and the high-pressure fluid are sprayed out of the spray port together. Through setting up the impeller, by high-pressure fluid drive, rethread rotates suction low pressure liquid to with relative mild and reliable mode, reduce kinetic energy and momentum difference between high-pressure fluid and the low pressure liquid earlier, mix in the mixing chamber after the energy is close, with further exchange kinetic energy and momentum, just can avoid because kinetic energy and momentum difference between high-pressure fluid and the low pressure liquid are too big, lead to mixing violently going on in the mixing chamber, produce huge noise, and cause the too big defect of energy consumption.

Description

Jet pump

Technical Field

The utility model belongs to the technical field of liquid delivery, and particularly relates to a jet pump.

Background

Jet pump, also called ejector pump, is a fluid mechanical and mixing reaction equipment which uses the turbulent diffusion action of jet to transfer energy and mass. A typical jet pump draws in a normally low pressure pumped liquid by flowing a high velocity jet of a high pressure fluid in a closed space, creating a vacuum negative pressure upstream, where the high pressure fluid and the low pressure liquid mix with each other in a mixing chamber, exchange kinetic energy and momentum, equivalent to driving the low velocity low pressure liquid from the high velocity high pressure fluid, and then co-flow out of an outlet.

The jet pump has the advantages of relatively simple structure, small size, reliable operation, no wearing parts, no leakage risk, no lubrication, low manufacturing and maintenance cost and wide application because of no moving parts. However, the energy efficiency of the jet pump is relatively low, and only about 30% of the energy efficiency can be achieved. Mainly because during operation, high-speed jet and low-speed low-pressure liquid are mixed vigorously in a relatively closed space, exchange energy and momentum, generate larger noise and energy consumption, and convert kinetic energy into heat energy.

Accordingly, there is a need for further improvements and enhancements in the art.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a jet pump, which increases the energy efficiency of the jet pump through structural improvement.

The jet pump comprises a pump body, wherein the inner cavity of the pump body is hollow tubular; the rear part of the pump body is provided with a high-pressure spray pipe communicated with high-pressure fluid, and the high-pressure spray pipe receives the high-pressure fluid and then sprays the high-pressure fluid into a mixing cavity in the front of the inner cavity;

the rear part of the pump body is also provided with a suction pipe for communicating low-pressure liquid to be sucked;

the high-pressure fluid and the low-pressure fluid are mixed in the mixing cavity and then sprayed out from the spraying port at the front part of the pump body;

an impeller is arranged between the high-pressure spray pipe and the mixing cavity in the inner cavity, the impeller is opposite to the high-pressure spray pipe, and the impeller can be driven to rotate after the high-pressure fluid is sprayed out;

the suction pipe and the high-pressure spray pipe are positioned on the same side of the impeller.

The jet pump of the utility model is provided with a high-pressure spray pipe, a suction pipe, an impeller, a mixing cavity and a jet orifice in sequence from back to front on a tubular passage in the inner cavity of the pump body, and the high-pressure spray pipe is opposite to the impeller. When the high-pressure jet pipe works, high-pressure fluid ejected from the high-pressure jet pipe flows through the impeller to drive the impeller to rotate, negative pressure is generated by rotation of the impeller, low-pressure liquid is sucked and accelerated from the periphery of the high-pressure jet pipe and even in the suction pipe, then enters the mixing cavity together with the high-pressure fluid, is mixed with each other in the mixing cavity, and further exchanges kinetic energy and momentum, and is expressed as that the high-pressure fluid drives the low-pressure liquid, and then is ejected from the ejection port together. The impeller which is opposite to the high-pressure fluid is arranged in the inner cavity of the jet pump body, and the impeller is driven by the high-pressure fluid to rotate, and then the peripheral low-pressure liquid is sucked and accelerated, so that the kinetic energy and the momentum difference between the high-pressure fluid and the low-pressure liquid are reduced in a relatively mild and reliable mode, the high-pressure fluid and the low-pressure liquid which are close to each other in energy are further mixed and exchanged in the mixing cavity, and the defects that the mixing in the mixing cavity is violently carried out, huge noise is generated and the energy consumption is overlarge due to overlarge difference between the high-pressure fluid and the low-pressure liquid can be avoided.

Preferably, a turbine is arranged at the center of the impeller and opposite to the high-pressure spray pipe, and the turbine and the impeller are coaxial and rotate in the same direction. Turbines are used primarily to convert the kinetic energy of a fluid into rotation of blades, while impellers are used primarily to drive fluid flow through rotation of blades. Therefore, a turbine is fixedly arranged at the position of the impeller, which is opposite to the nozzle of the high-pressure spray pipe, and the impeller and the turbine are coaxial and rotate in the same direction, namely the inclination directions of the blades are consistent. Therefore, when the high-pressure fluid is sprayed forwards, the turbine is pushed to rotate, the turbine drives the impeller to rotate, and the low-pressure liquid around the high-pressure spray pipe is sucked and compressed and is also sent forwards into the mixing cavity, so that the working efficiency of the jet pump is further improved.

Preferably, the impeller is fixed at the nozzle of the high-pressure nozzle through a bracket. In theory, the impeller may be mounted in any manner that is capable of being secured within the internal cavity and does not impede fluid flow as much as possible. The impeller is directly fixed at the nozzle, so that the impeller can be ensured to be opposite to the nozzle when being installed, and the impeller is not easy to deviate due to vibration and the like in use, and the rotating effect of the impeller driven by high-pressure fluid is affected.

Preferably, the diameter of the impeller is comparable to the diameter of the internal cavity at the location, and when the impeller rotates, the low-pressure liquid can be pumped into the mixing cavity. The diameter of the impeller is close to the diameter of the inner cavity at the position, so that almost all low-pressure liquid can be directly compressed when the impeller rotates, and the driving effect on the low-pressure liquid is ensured.

Preferably, in the inner cavity, the diameter of the mixing cavity is larger than the diameter of the inner cavity where the impeller is located. That is, after the high-pressure fluid and the low-pressure liquid flow from the pipe into the mixing chamber, since the flow cross-sectional area increases, the flow rate decreases and the pressure increases, so that the high-pressure fluid and the low-pressure liquid are further mixed, exchanging kinetic energy and momentum. However, since part of the kinetic energy of the high-pressure fluid has been transferred to the low-pressure liquid by the rotation of the blades, the kinetic energy and momentum gap between the high-pressure fluid and the low-pressure liquid has been reduced, and thus the noise and energy consumption caused by mixing have been reduced accordingly.

Preferably, the high-pressure nozzle communicates with a high-pressure pump through a high-pressure pipe, and the high-pressure pump is used for outputting high-pressure fluid. In one embodiment, a high pressure pump is used to drive the high pressure fluid, thereby ensuring the speed of the high pressure fluid injection, as well as the effectiveness of driving the impeller.

More preferably, the high pressure pump is a plunger pump. Compared with a centrifugal pump, the plunger pump is more suitable for generating high-pressure but low-flow fluid driving, so that the plunger pump is very suitable for a jet pump, ensures that high-pressure fluid ejected by a high-pressure spray pipe in the jet pump has high enough pressure to drive an impeller to rotate, and sucks and accelerates low-pressure liquid around the impeller.

Preferably, the high pressure nozzle includes a sealing layer that prevents leakage of the high pressure fluid, and further preferably, the sealing layer is made of a carbon fiber material. The high-pressure spray pipe is generally thick because of bearing and circulating high-pressure fluid, and can be mainly made of organic materials with certain tensile strength, for example, most of flexible pipe plastics such as polyethylene fibers and the like are adopted, and plastic particles are embedded after a framework is formed by weaving, so that the tightness of the high-pressure spray pipe is ensured by heat treatment. The pipe is made of carbon fiber material, namely, the carbon fiber composite material is pre-soaked in styrene-based polyester resin and then heated, solidified and pultruded, the shock resistance can reach 3000MPa, and compared with common plastic materials or metal materials, the pipe has higher tensile resistance, strength and toughness, the strength is 8-10 times that of common steel materials, but the weight is only 1/5. This helps to reduce the weight of the high pressure nozzle, and thus the weight of the jet pump, while maintaining sufficient strength of the high pressure nozzle.

More preferably, the high-pressure spray pipe is of a multi-layer composite structure, and further comprises a tensile layer, wherein the tensile layer is sleeved outside the sealing layer or embedded in the sealing layer; the tensile layer is a net structure woven by silk-like tensile materials. If the high-pressure spray pipe is made of organic materials, the high-pressure resistance is required, and the wall thickness is required to be thick, so that the weight of the high-pressure spray pipe is greatly increased. Therefore, the adoption of a multi-layer composite structure is a good choice. The tensile layer is arranged outside the sealing layer or embedded in the sealing layer, for example, a net structure woven by silk-shaped tensile materials is used for bearing most of the pressure of high-pressure fluid in the high-pressure spray pipe, so that the wall thickness and even the weight of the high-pressure spray pipe can be greatly reduced. And greatly increases the pressure bearing capacity of the high-pressure spray pipe on the internal high-pressure fluid.

Preferably, the device further comprises an atomizer, wherein the atomizer is sleeved on the jet orifice and is used for atomizing fluid ejected from the jet orifice. In consideration of the fact that water flow and the like emitted by the jet pump are required to be atomized for better work such as fire extinguishing and the like, the jet pump can be sleeved with an atomizer on the jet orifice. Thus, the fluid sprayed from the spray orifice can be atomized for use in applications requiring high pressure spraying.

The working method of the jet pump comprises the following steps:

a. the high-pressure spray pipe sprays high-pressure fluid to the mixing cavity;

b. the high-pressure fluid drives the impeller to rotate;

c. the rotating impeller sucks in and pressurizes the low-pressure liquid from the suction pipe;

d. the high-pressure fluid and the low-pressure liquid enter a mixing cavity for further mixing, and kinetic energy and momentum are exchanged;

e. the mixed high-pressure fluid and low-pressure liquid are ejected from the ejection port.

The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a jet pump of the present utility model;

FIG. 2 is a schematic view of the impeller of the jet pump of the present utility model;

FIG. 3 is a schematic view of the construction of a atomizer in a jet pump according to the present utility model;

FIG. 4 is a flow chart of a method of operation of the jet pump of the present utility model;

in the figure, the high-pressure spray pipe 11-is, the suction pipe 12-is, the mixing cavity 13-is, the jet orifice 14-is, the atomizer 15-is, the impeller 16-is, the support 17-is, the connecting sleeve 150-is, the radial air inlet 151-is, the atomizing cavity 152-is, the spray orifice 153-is, the blade 161-is and the turbine 162-is.

Detailed Description

The utility model provides a jet pump, and in order to make the purposes, technical schemes and effects of the utility model clearer and more definite, the utility model is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The specific structure of the jet pump 10 is shown in fig. 1, and comprises a pump body, wherein the inner cavity of the rod body is of a hollow tubular structure, a high-pressure spray pipe 11 for inputting high-pressure fluid is arranged at the rear part of the inner cavity, a suction pipe 12 for allowing low-pressure fluid to flow in is arranged at the rear part of the inner cavity, and a jet orifice 14 is arranged at the front part of the inner cavity. In front of the high pressure nozzle 11, an impeller 16 is provided directly opposite to the nozzle of the high pressure nozzle 11. The high-pressure fluid ejected from the high-pressure nozzle 11 drives the impeller 16 to rotate, and when the impeller 16 rotates, the low-pressure liquid around the high-pressure nozzle 11 is pumped, and is pressurized by rotation, and then is sent into the mixing cavity 13 in front of the impeller 16 together with the high-pressure fluid, so that further energy and momentum exchange is performed. When the low-pressure liquid around the high-pressure nozzle 11 is sucked, the low-pressure liquid is continuously sucked from the suction pipe 12, and the pulling effect of the low-pressure liquid is realized. And finally, the high-pressure fluid and the low-pressure liquid which finish the kinetic energy and momentum exchange are ejected from the injection port 14 at the forefront of the inner cavity together by virtue of inertia, so that the low-pressure liquid is driven by the high-pressure fluid.

Compared with the jet pump in the prior art, the impeller 16 is arranged in the inner cavity of the jet pump and positioned between the high-pressure spray pipe 11 and the mixing cavity 13, when the high-pressure fluid is sprayed out of the spray nozzle of the high-pressure spray pipe 11, the peripheral low-pressure fluid is not directly sucked, but the impeller 11 is driven to rotate, the peripheral low-pressure fluid is sucked and accelerated when the impeller 11 rotates, the impeller 11 rotates and drives the low-pressure fluid, the kinetic energy and the momentum of a high-pressure fluid part are consumed, so that the kinetic energy and the momentum difference between the high-pressure fluid and the low-pressure fluid are reduced in a relatively mild and reliable mode, and then the high-pressure fluid and the low-pressure fluid with the energy being close enter the mixing cavity 13. Because the sectional area of the mixing chamber is larger than the sectional area of the inner cavity before the impeller 11, the high-pressure fluid and the low-pressure liquid can be decelerated after entering the mixing chamber, and further mixing and exchange can be performed, so that the defects of severe mixing in the mixing chamber, huge noise and excessive energy consumption caused by overlarge difference between the kinetic energy and the momentum of the high-pressure fluid and the low-pressure liquid can be avoided.

That is, in the inner cavity, from the back to the front, there are arranged in order: the high-pressure nozzle 11, the suction pipe 12, the impeller 16, the mixing chamber 13 and the injection port 14, and the high-pressure nozzle 11 is opposite to the rotation center position of the impeller 16.

In order to increase the efficiency of the high pressure fluid driving the impeller 12, in a preferred embodiment, a turbine 162 is provided on the axis of rotation of the impeller 12, as shown in FIG. 2. Of course, the turbine 162 rotates coaxially with the impeller 12, and the direction of rotation is the same when driven by the incoming flow in the same direction. I.e. the turbine 162 is driven by the high-pressure fluid, the turbine 162 drives the impeller 12 to rotate, and the impeller 12 rotates to suck and accelerate the low-pressure fluid. Because the turbine is better suited to convert the kinetic energy of the fluid into rotational energy of the blades, while the impeller is adapted to convert rotational energy into kinetic energy of the fluid. In order to ensure that the rotation directions of the turbine 162 and the blades 161 are the same, the rotation angles of both need only be positive or negative, that is, the rotation angles are inclined in the same direction when the turbine and the blades are mounted.

In a preferred embodiment, as shown in fig. 1, the impeller 16 is mounted at the nozzle of the high pressure nozzle 11 by a set of brackets 17. The support 17 may be two or three or more separate small rod-shaped columns, or may be a tubular structure with an inner diameter slightly larger than the diameter of the rotation shaft of the vane 161, so long as it can ensure that most of the high-pressure fluid impacts the impeller 16 and drives the impeller 16 to rotate when the high-pressure fluid is ejected toward the impeller 16. Basically, the noise and energy loss generated by the jet pump can be greatly reduced by allowing the high pressure fluid between the impeller 16 and the high pressure nozzle 11 to avoid direct contact with the surrounding low pressure fluid and transfer momentum and kinetic energy. The impeller 16 and the high-pressure spray pipe 11 are mutually fixed, so that the phenomenon that the nozzle of the high-pressure spray pipe 11 deviates from the central part of the impeller 16 due to vibration of a jet pump and the like is avoided, and the driving rotation efficiency of high-pressure fluid to the impeller 16 is reduced.

Wherein the diameter of the impeller 16 is preferably comparable to the diameter of the lumen at the location, i.e. the impeller 16 reaches almost the inner wall of the peripheral lumen. Thus, when the impeller 16 rotates, all the low-pressure liquid in the inner cavity can be pumped, pressurized and fed into the mixing cavity 13.

In a preferred embodiment, as shown in fig. 1, the mixing chamber 13 preferably has an inner diameter greater than the inner diameter of the inner chamber in which the impeller 16 is located. That is, when high pressure fluid and low pressure fluid are caused to flow in, the velocity is reduced and the pressure is increased, which facilitates the two to be sufficiently mixed to exchange energy and momentum and reduce noise. In particular, turbulence may be reduced to laminar flow, so that energy and momentum exchange is very quiet.

In use, the high pressure nozzle 11 communicates via a high pressure line with a high pressure pump for delivering high pressure fluid. Wherein the high pressure pump is preferably a plunger pump. Plunger pumps can provide large pressures but small flows. And is therefore relatively more suitable for delivering high pressure fluid to the high pressure nozzle 11.

The high pressure nozzle 11 comprises at least one sealing layer to ensure that the fluid in the pipe does not leak under high internal pressure. The sealing layer is preferably made of a carbon fiber material having superior tensile strength, so that the wall thickness of the high-pressure nozzle 11 can be reduced, and the weight of the high-pressure nozzle can be reduced.

Because the material of the sealing layer is typically an organic plastic material, in one embodiment, a tensile layer may be added. The tensile layer can be embedded into the sealing layer or sleeved outside the sealing layer. So long as it helps the seal layer withstand the lateral pressure of most high pressure fluids. The high pressure nozzle 11 is thus selected to be a multi-layer composite structure which helps to provide strength to the high pressure nozzle 11 and reduces the thickness or even the weight of the high pressure nozzle 11. The tensile layer can be selected to be a net structure woven by silk-shaped tensile materials and sleeved outside the sealing layer or embedded in the sealing layer in a mode of inclining at 45 degrees with the axial direction of the high-pressure spray pipe 11.

In a preferred embodiment, the injection port 14 is further covered with an atomizer 15 for atomizing the injected fluid. One embodiment of the atomizer 15, as shown in fig. 3, is a cylindrical structure with a set of radial air inlet holes 151, and is covered on the injection port 14 by a connecting sleeve 150. When the fluid ejected from the ejection port 14 flows through the passage of the atomizer, the generated negative pressure in the lateral direction sucks air from the radial air intake hole 151, enters the atomizing chamber 152 together with the fluid, is atomized, and is ejected from the nozzle 153. The atomizer 15 may also be commercially available and is not described herein.

The working method of the jet pump of the utility model, as shown in fig. 4, comprises the following steps:

a. the high-pressure spray pipe 11 sprays high-pressure fluid into the mixing cavity 13;

b. the high pressure fluid drives the impeller 16 to rotate;

c. the rotating impeller 16 sucks in and pressurizes the low-pressure liquid from the suction pipe 12;

d. the high-pressure fluid and the low-pressure fluid enter the mixing cavity 13 for further mixing, and exchange kinetic energy and momentum;

e. the mixed high-pressure fluid and low-pressure liquid are ejected from the ejection port 14.

In summary, in the jet pump of the present utility model, the high-pressure nozzle 11, the suction pipe 12, the impeller 16, the mixing chamber 13 and the injection port 14 are sequentially disposed on the tubular passage of the pump body cavity from the back to the front, and the high-pressure nozzle 11 faces the impeller 16. In operation, the high pressure fluid ejected from the high pressure nozzle 11 flows through the impeller 16 to drive the impeller 16 to rotate, the impeller 16 rotates to generate negative pressure, and the low pressure liquid is sucked and accelerated from the periphery of the high pressure nozzle 11 and even from the suction pipe 12, then enters the mixing cavity 13 together with the high pressure fluid, is mixed with each other in the mixing cavity, and further exchanges kinetic energy and momentum, and is expressed as that the high pressure fluid drives the low pressure liquid, and then is ejected from the ejection port 14 together. In the utility model, the impeller 16 which is opposite to the high-pressure fluid is arranged in the inner cavity of the jet pump body, and the low-pressure fluid at the periphery is sucked and accelerated after being driven to rotate by the high-pressure fluid, so that the kinetic energy and the momentum difference between the high-pressure fluid and the low-pressure fluid are reduced in a relatively mild and reliable mode, the high-pressure fluid and the low-pressure fluid with the energy being close to each other are further mixed and exchanged in the mixing cavity 13, and the defects that the mixing in the mixing cavity 13 is violently carried out, huge noise is generated and the energy consumption is overlarge because the difference between the high-pressure fluid and the low-pressure fluid is overlarge can be avoided.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (10)

1. The jet pump is characterized by comprising a pump body, wherein the inner cavity of the pump body is hollow tubular; the rear part of the pump body is provided with a high-pressure spray pipe communicated with high-pressure fluid, and the high-pressure spray pipe receives the high-pressure fluid and then sprays the high-pressure fluid into a mixing cavity in the front of the inner cavity;

the rear part of the pump body is also provided with a suction pipe for communicating low-pressure liquid to be sucked;

the high-pressure fluid and the low-pressure fluid are mixed in the mixing cavity and then sprayed out from the spraying port at the front part of the pump body;

an impeller is arranged between the high-pressure spray pipe and the mixing cavity in the inner cavity, the impeller is opposite to the high-pressure spray pipe, and the impeller can be driven to rotate after the high-pressure fluid is sprayed out;

the suction pipe and the high-pressure spray pipe are positioned on the same side of the impeller.

2. The jet pump of claim 1, wherein a portion of the impeller opposite the high pressure nozzle is provided with a turbine wheel at the center thereof, the turbine wheel and the impeller wheel being coaxial and rotating in the same direction.

3. Jet pump according to claim 1 or 2, characterized in that the impeller is fixed to the nozzle of the high-pressure nozzle by means of a bracket.

4. A jet pump as claimed in claim 1 or claim 2 wherein the impeller has a diameter comparable to the diameter of the internal cavity in which it is located, and wherein the impeller is arranged to draw the low pressure liquid into the mixing chamber as it rotates.

5. Jet pump according to claim 1 or 2, characterized in that in the inner cavity the diameter of the mixing chamber is larger than the diameter of the inner cavity where the impeller is located.

6. Jet pump according to claim 1 or 2, characterized in that the high-pressure nozzle communicates with a high-pressure pump via a high-pressure line, which high-pressure pump is used for outputting high-pressure fluid.

7. The jet pump of claim 6, wherein the high pressure pump is a plunger pump.

8. Jet pump according to claim 1 or 2, characterized in that the high-pressure nozzle comprises a sealing layer which prevents leakage of high-pressure fluid.

9. The jet pump of claim 8, wherein the high pressure nozzle is a multi-layer composite structure, further comprising a tensile layer that is sleeved outside of the sealing layer or embedded within the sealing layer; the tensile layer is a net structure woven by silk-like tensile materials.

10. A jet pump as claimed in claim 1 or claim 2, further comprising an atomizer, the atomizer being arranged around the jet orifice for atomizing fluid ejected from the jet orifice.