A vortex-enhanced ejector pump and its usage method

Abstract

The present invention provides a vortex-enhanced ejector pump and its usage method, which includes an ejector pump body and a controller; the ejector pump body includes a suction chamber, a spiral guide vane, a vortex mixing chamber and a diffuser section. The suction chamber, the vortex mixing chamber and the diffuser section are fixedly connected in sequence. A nozzle is arranged in the suction chamber, and a high-pressure primary flow fluid is sprayed into the vortex mixing chamber through the nozzle. The low-pressure secondary flow fluid is sucked into the vortex mixing chamber through the suction chamber. A spiral guide vane is arranged in the vortex mixing chamber, and the spiral guide vane is used to enhance the vortex effect of the fluid in the vortex mixing chamber, promote the mixing and energy exchange of the primary flow fluid and the secondary flow fluid, and the diffuser section is used to diffuse the mixed fluid. The present invention improves the fluid boosting efficiency and energy utilization rate of the ejector pump. In practical applications such as long-distance pipeline compressor stations and natural gas purification, it can significantly improve the fluid boosting efficiency, reduce energy loss, and adapt to complex variable working condition requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of ejector pumps, and particularly relates to a vortex-enhanced ejector pump and a method for using the same. Background Art

[0002] An ejector pump is a device that uses a liquid with a certain pressure as the working liquid to suck or eject a liquid with a lower pressure or even no pressure. Its conventional structure includes a working liquid inlet and a jet orifice, a suction inlet for the liquid to be ejected, a mixing and diffusing area, and a discharge outlet. The working fluid inlet receives the pressurized working fluid and ejects it through the jet orifice. The ejected liquid creates a vacuum environment around the jet orifice, thereby causing the low-pressure or non-pressure liquid to be ejected to be sucked in from the suction inlet. The sucked-in liquid and the ejected working liquid flow into the mixing and diffusing section together, where they are mixed and the pressure is balanced, and then ejected through the discharge outlet. Ejector pumps are widely used in many fluid devices. In the fields of long-distance pipeline compressor stations, chemical production, petroleum refining, natural gas purification, coal mine gas drainage, and aerospace engine testing, the requirements for fluid pressurization technology are increasing day by day, and traditional ejector pumps are difficult to meet the needs of high efficiency and energy conservation.

[0003] The compression ratio of existing conventional ejector pumps usually cannot exceed 2.5, which limits the application range. Moreover, the mixing efficiency is low, the mixing of fluids in the mixing chamber is not sufficient, affecting the energy exchange efficiency; the working condition adaptability is poor, and it is difficult to cope with the fluctuating changes of the inlet fluid pressure and flow rate; the energy utilization rate is low, and the energy of the high-pressure driving fluid is not fully utilized.

[0004] Based on this, a vortex-enhanced ejector pump and a method for using the same are proposed to improve the fluid pressurization efficiency and reduce energy loss. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a vortex-enhanced ejector pump and a method for using the same to solve the problems mentioned in the above background art in view of the deficiencies of the above-mentioned prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is:

[0007] In a first aspect, a vortex-enhanced ejector pump includes an ejector pump body and a controller;

[0008] The ejector pump body includes a suction chamber, spiral guide vanes, a vortex mixing chamber, and a diffuser section. The suction chamber, vortex mixing chamber, and diffuser section are fixedly connected in sequence. A nozzle is arranged in the suction chamber, and high-pressure primary flow fluid is sprayed into the vortex mixing chamber through the nozzle. Low-pressure secondary flow fluid is sucked into the vortex mixing chamber through the suction chamber. Spiral guide vanes are arranged in the vortex mixing chamber, and the spiral guide vanes are used to enhance the vortex effect of the fluid in the vortex mixing chamber, promote the mixing and energy exchange of the primary flow fluid and the secondary flow fluid, and the diffuser section is used to diffuse the mixed fluid;

[0009] The ejector pump body is installed in a liquid storage barrel. The liquid suction port of the ejector pump body to be ejected is communicated with the liquid in the liquid tank, and the discharge port of the ejector pump body is communicated with the liquid in the liquid storage barrel. A suction port valve and a suction port pressure sensor are also installed on the liquid suction port of the ejector pump body to be ejected. An ejection valve is arranged on the ejector pump body, and the suction port valve, ejection valve, and suction port pressure sensor are respectively connected with the controller in a signal connection.

[0010] As a further description of the present invention, the spiral angle of the spiral guide vanes is 30° - 60°, the blade height of the spiral guide vanes is 10% - 20% of the diameter of the vortex mixing chamber, and the number of blades of the spiral guide vanes is 4 - 8.

[0011] As a further description of the present invention, the length of the contraction section of the vortex mixing chamber is 30% - 50% of the total length of the vortex mixing chamber, and the contraction angle of the contraction section is 10° - 20°.

[0012] As a further description of the present invention, the diffusion angle of the diffuser section is 5° - 15°, and the length of the diffuser section is 20% - 30% of the total length of the vortex mixing chamber.

[0013] As a further description of the present invention, a liquid level sensor is also connected to the controller in a signal connection, and the liquid level in the liquid tank is monitored through the liquid level sensor.

[0014] As a further description of the present invention, the spiral guide vanes are also connected to an actuator in a signal connection, the controller is connected to the actuator in a signal connection, and the controller adjusts the spiral angle and height of the spiral guide vanes through the actuator.

[0015] Second aspect, a method for using a vortex-enhanced ejector pump, comprising the following steps:

[0016] First, install the ejector pump body in a liquid storage barrel. The liquid suction port of the ejector pump body to be ejected is communicated with the liquid in the liquid tank, and the discharge port of the ejector pump body is communicated with the liquid in the liquid storage barrel;

[0017] Then start the first liquid pump, keep the pressure of the working fluid at a fixed value by adjusting the output of the first liquid pump, pump the fluid in the liquid tank into the working fluid inlet of the ejector pump body to make the ejector pump body start to work, and calculate the pressure loss of the ejector pump in real time using the following formula :

[0018] ;

[0019] where is the pressure loss of the ejector pump;

[0020] is the fluid density;

[0021] is the fluid flow velocity;

[0022] is the dimensionless Darcy friction coefficient;

[0023] is the length of the pipeline where the ejector pump is located;

[0024] is the diameter of the ejector pump;

[0025] If exceeds the threshold, adjust the spiral angle of the spiral guide vane 703 using the following formula to reduce the pressure loss to an acceptable range;

[0026] ;

[0027] where is the spiral angle of the initial spiral guide vane;

[0028] is the proportionality coefficient between the pressure loss and the spiral angle to be adjusted;

[0029] Evaluate the actual mixing efficiency using the following formula η ;

[0030] ;

[0031] where C is the specific heat of the fluid;

[0032] If η is lower than the set mixing efficiency, increase the blade height and recalculate the eddy current intensity until η reaches the standard;

[0033] Then use the liquid level sensor to monitor the change in the liquid level height in the liquid tank, use the controller to calculate the increasing speed of the fluid volume, and determine the flow rate of the ejector pump body.

[0034] The present invention has the following advantages compared with the prior art:

[0035] In the present invention, spiral guide vanes are arranged in the ejector pump body, and the spiral guide vanes enhance the eddy current effect of the fluid in the eddy current mixing cavity, promote the full mixing and energy exchange of the primary flow fluid and the secondary flow fluid, thereby improving the fluid boosting efficiency and energy utilization rate of the ejector pump. In practical applications such as long-distance pipeline compressor stations and natural gas purification, it can significantly improve the fluid boosting efficiency, reduce energy loss, and meet the requirements of complex variable working conditions. Description of the Drawings

[0036] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 is a schematic diagram of the structure of the ejector pump body of the present invention;

[0038] Figure 3 is a schematic diagram of the installation structure of the spiral guide vanes of the present invention;

[0039] Description of the Reference Numerals:

[0040] 1 - suction port valve; 2 - ejector valve; 3 - liquid level sensor; 4 - suction port pressure sensor; 5 - liquid storage barrel; 6 - liquid tank; 7 - ejector pump body; 701 - nozzle; 702 - suction chamber; 703 - spiral guide vane; 704 - eddy current mixing cavity; 705 - diffuser section; 8 - controller; 9 - first liquid pump; 10 - actuator. Detailed Embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] As Figures 1 - 3 shown, the present invention provides a technical solution: an eddy current enhanced ejector pump, including an ejector pump body 7 and a controller 8;

[0043] The ejector pump body 7 includes a suction chamber 702, spiral guide vanes 703, an eddy current mixing cavity 704, and a diffuser section 705. The suction chamber 702, the eddy current mixing cavity 704, and the diffuser section 705 are fixedly connected in sequence. A nozzle 701 is arranged in the suction chamber 702, and the high-pressure primary flow fluid is sprayed into the eddy current mixing cavity 704 through the nozzle 701, and the low-pressure secondary flow fluid is sucked into the eddy current mixing cavity 704 through the suction chamber 702;

[0044] A spiral guide vane 703 is arranged in the eddy current mixing chamber 704. The length of the contraction section of the eddy current mixing chamber 704 is 30%-50% of the total length of the eddy current mixing chamber 704, and the contraction angle of the contraction section is 10°-20°.

[0045] The spiral angle of the spiral guide vane 703 is 30°-60°. The blade height of the spiral guide vane 703 is 10%-20% of the diameter of the eddy current mixing chamber 704, and the number of blades of the spiral guide vane 703 is 4-8.

[0046] The spiral guide vane 703 is also signal-connected to an actuator 10. The actuator 10 includes an angle stepping motor for controlling the spiral angle of the spiral guide vane 703 and a height stepping motor for controlling the radial height of the spiral guide vane 703 in the eddy current mixing chamber 704. The angle stepping motor and the height stepping motor are respectively signal-connected to the controller. The angle stepping motor and the height stepping motor are controlled by the stepping pulse signal given by the through-tube controller 8, so that the spiral angle of the spiral guide vane 703 can be changed by the angle stepping motor, and the radial height of the spiral guide vane 703 in the eddy current mixing chamber 704 can be adjusted by the height stepping motor.

[0047] The spiral guide vane 703 is used to enhance the eddy current effect of the fluid in the eddy current mixing chamber 704 and promote the mixing and energy exchange of the primary flow fluid and the secondary flow fluid.

[0048] The diffusing angle of the diffusing section 705 is 5°-15°. The length of the diffusing section 705 is 20%-30% of the total length of the eddy current mixing chamber 704. The diffusing section 705 is used to diffuse the mixed fluid.

[0049] The ejector pump body 7 is installed in the liquid storage barrel 5. The liquid suction port to be ejected of the ejector pump body 7 is communicated with the liquid in the liquid tank 6. The discharge port of the ejector pump body 7 is communicated with the liquid in the liquid storage barrel 5. A suction port valve 1 and a suction port pressure sensor 4 are also installed on the liquid suction port to be ejected of the ejector pump body 7. An ejection valve 2 is arranged on the ejector pump body 7. When the ejector pump works, the ejection effect is controlled by the ejection valve 2, and the liquid in the liquid storage barrel 5 is sucked into the ejector pump 7. The suction port valve 1, the ejection valve 2 and the suction port pressure sensor 4 are respectively signal-connected to the controller 8.

[0050] A liquid level sensor 3 is also signal-connected to the controller 8, and the liquid level in the liquid tank 5 is monitored by the liquid level sensor 3.

[0051] The using method of the above eddy current enhanced ejector pump includes the following steps:

[0052] First, install the ejector pump body 7 in the liquid storage barrel 5. The liquid suction inlet of the ejector pump body 7 to be ejected is communicated with the liquid in the liquid tank 6, and the discharge outlet of the ejector pump body 7 is communicated with the liquid in the liquid storage barrel 5;

[0053] Then start the first liquid pump 9. By adjusting the output of the first liquid pump 9 to keep the pressure of the working fluid at a fixed value, pump the fluid in the liquid tank 5 into the working fluid inlet of the ejector pump body 7 to make the ejector pump body 7 start to work, and use the following formula to calculate the pressure loss of the ejector pump in real time :

[0054] ;

[0055] Among them, is the pressure loss of the ejector pump;

[0056] is the fluid density;

[0057] is the fluid flow velocity;

[0058] is the dimensionless Darcy friction coefficient;

[0059] is the length of the pipeline where the ejector pump is located;

[0060] is the diameter of the ejector pump;

[0061] If exceeds the threshold value, adjust the spiral angle of the spiral guide vane 703 through the following formula , so that the pressure loss is reduced to the allowable range;

[0062] ;

[0063] Among them is the initial spiral angle of the spiral guide vane 703;

[0064] is the proportional coefficient between the pressure loss and the spiral angle to be adjusted;

[0065] Use the following formula to evaluate the actual mixing efficiency η ;

[0066] ;

[0067] Among them, C is the specific heat of the fluid;

[0068] If η is lower than the set mixing efficiency, increase the blade height and recalculate the eddy current intensity to ηMeet the standard;

[0069] The liquid level sensor 3 is used to monitor the change in the liquid level height of the liquid in the liquid tank 5, and the controller 8 is used to calculate the increasing speed of the fluid volume to determine the flow rate of the ejector pump body 7.

[0070] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0071] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vortex-enhanced ejector pump, characterized in that: It comprises an ejector pump body (7) and a controller (8); The ejector pump body (7) comprises a suction chamber (702), a spiral guide vane (703), a vortex mixing chamber (704) and a diffuser section (705); the suction chamber (702), the vortex mixing chamber (704) and the diffuser section (705) are fixedly connected in sequence; a nozzle (701) is arranged in the suction chamber (702); a high-pressure primary flow fluid is sprayed into the vortex mixing chamber (704) through the nozzle (701); a low-pressure secondary flow fluid is sucked into the vortex mixing chamber (704) through the suction chamber (702); a spiral guide vane (703) is arranged in the vortex mixing chamber (704); and a spiral angle of the spiral guide vane (703) is 30°-60°. , the blade height of the spiral guide vane (703) is 10%-20% of the diameter of the vortex mixing chamber (704), the number of blades of the spiral guide vane (703) is 4-8, the spiral guide vane (703) is also signal-connected to an actuator (10), the controller (8) is signal-connected to the actuator (10), the controller (8) adjusts the spiral angle and height of the spiral guide vane (703) through the actuator (10), the spiral guide vane (703) is used to enhance the vortex effect of the fluid in the vortex mixing chamber (704), promote the mixing and energy exchange of the primary flow fluid and the secondary flow fluid, and the diffuser section (705) is used to diffuse the mixed fluid; The ejection pump body (7) is installed in the liquid storage barrel (5); the liquid suction port of the ejection pump body (7) is in communication with the liquid in the liquid tank (6); the discharge port of the ejection pump body (7) is in communication with the liquid in the liquid storage barrel (5); the liquid suction port of the ejection pump body (7) is also installed with an inlet pressure sensor (4), an inlet valve (1) and a first liquid pump (9); the ejection pump body (7) is provided with an ejection valve (2); the inlet valve (1), the ejection valve (2) and the inlet pressure sensor (4) are respectively connected to the controller (8) for signal transmission.

2. A vortex-enhanced jet pump according to claim 1, characterized in that: The length of the contraction section of the vortex mixing chamber (704) is 30%-50% of the total length of the vortex mixing chamber (704), and the contraction angle of the contraction section is 10°-20°.

3. A vortex-enhanced ejector pump according to claim 1, characterized in that: The diffusion angle of the diffusion section (705) is 5°-15°, and the length of the diffusion section (705) is 20%-30% of the total length of the vortex mixing chamber (704).

4. The vortex-enhanced jet pump according to claim 1, characterized in that: The controller (8) is also signal-connected to a liquid level sensor (3), and the liquid level of the liquid in the liquid tank (6) is monitored by the liquid level sensor (3).

5. A method for using a vortex-enhanced ejector pump according to any one of claims 1 to 4, characterized in that: The following steps are involved: First, the ejector pump body (7) is installed in the liquid storage barrel (5), the liquid suction port of the ejector pump body (7) is connected to the liquid in the liquid tank (6), and the ejector pump body (7) is connected to the liquid in the liquid storage barrel (5); Then, the first liquid pump (9) is started, and the pressure of the working fluid is maintained at a fixed value by adjusting the output of the first liquid pump (9). The fluid in the liquid tank (6) is pumped into the working fluid inlet of the ejector pump body (7), so that the ejector pump body (7) starts to work. The pressure loss of the ejector pump is calculated in real time using the following formula: : ； in, is the pressure loss of the ejector pump; is the fluid density; is the fluid flow rate; is the dimensionless Darcy friction coefficient; is the length of the pipeline where the ejector pump is located; is the diameter of the ejector pump; like When the threshold is exceeded, the spiral angle of the spiral guide vane (703) is adjusted by the following formula , so that the pressure loss is reduced to within the allowable range; ； in is the spiral angle of the initial spiral guide vane (703); is the proportional coefficient between the pressure loss and the spiral angle to be adjusted; The actual mixing efficiency is estimated using the following formula η ; ； in, C is the specific heat of the fluid; like η If the mixing efficiency is lower than the set value, the blade height is increased and the vortex intensity is recalculated to η Meet the standards; The liquid level sensor (3) is then used to monitor the change in the liquid level height of the liquid in the liquid tank (6), and the controller (8) is used to calculate the increase rate of the fluid volume to determine the flow rate of the ejector pump body (7).

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