CN110608067A - low pressure jet engine - Google Patents

Abstract

The application discloses a low-pressure jet power machine, which includes a stator and a rotor; a first cavity and a second cavity are arranged inside the stator; and the rotor includes an output shaft, an air jet pipe and an air intake shaft. Since the stator has two cavities, the rotor is installed in the inner cavity of the stator, and the jet tube inside the rotor is provided with an expansion cavity that changes from small to large and a jet cavity that changes from large to small, so that the low-temperature steam is decompressed first after entering the jet tube After expansion, the expanded low-pressure steam is recompressed and ejected from the air nozzle around the air nozzle along the tangential direction to another cavity of the stator. The injection force of the air nozzle and the pressure difference between the two cavities in the stator will accelerate the rotation of the rotor. Therefore, low-quality media such as low-temperature steam introduced into the low-pressure jet power machine can also drive the output shaft to output work, and the low-quality media can be recycled to save energy.

Description

low pressure jet engine

technical field

The application relates to a power device, in particular to a low-pressure jet power machine.

Background technique

At present, the driving equipment for thermal power generation is mainly steam turbines, gas turbines, piston internal combustion engines, etc., the primary conversion efficiency is generally between 20% and 40%, and the required medium (steam or gas, etc.) is of high grade and the system structure is relatively complicated, but The above-mentioned types of power generation devices are very mature, and they are widely used in different occasions. And low-quality medium, such as low-temperature steam, cannot be used because it cannot drive the existing power machine, resulting in direct discharge of low-temperature steam, wasting energy.

Contents of the invention

The present application provides a low-pressure jet engine that can be driven by low-quality media.

In one embodiment, a low-pressure jet power machine is provided, comprising a stator and a rotor;

The inside of the stator is provided with a first cavity and a second cavity, the first cavity is located in the middle, the second cavity is arranged around the first cavity, and an annular air vent is provided between the first cavity and the second cavity, The second cavity is provided with an exhaust port that communicates with the outside world;

The rotor includes an output shaft, an air jet pipe and an air intake shaft. The output shaft and the air intake shaft are located at both ends of the air jet pipe. One end of the air jet pipe is provided with an air inlet, and the other end is a closed end. On the side wall of the closed end, there is a A plurality of evenly distributed air nozzles tangent to the circumferential surface. The air injection pipe is provided with an expansion chamber and an injection chamber connected along the air intake direction. The expansion chamber is gradually enlarged and set, and the injection chamber is differentiated and gradually reduced to the surroundings. The expansion chamber The small opening of the injection chamber is connected with the air inlet, and the narrowed end of the injection chamber is connected with the air nozzle; the rotor is rotatably mounted on the stator through the output shaft and the air inlet shaft, the air injection pipe is located in the first cavity, and the air injection nozzle of the air injection pipe is connected with the second air nozzle. The air vents between the first cavity and the second cavity are oppositely arranged.

Further, the jet pipe includes a conical pipe and a straight pipe, the straight pipe is docked with the large mouth end of the conical pipe, the conical pipe has a gradually expanding expansion chamber, the end of the straight pipe is sealed, and an air guide head is provided inside the closed end, the guide The gas head extends toward the conical tube with its outer diameter gradually reduced, and the straight tube and the inner gas guide head form a jet cavity that gradually shrinks from the middle to the surrounding; the air inlet of the jet tube is set on the conical tube, and the jet nozzle of the jet tube Set on the side wall of the straight pipe.

Further, the air nozzle is gradually reduced along the air injection direction.

Further, the annular ventilation opening between the first cavity and the second cavity is covered with side-by-side louvers.

Further, the vanes of the louvers are set by deflecting at a preset angle along the axial direction of the air jet pipe, so that the vanes of the louvers are opposite to the airflow ejected from the air nozzles to form an ejection support.

Further, there are three jet nozzles, which are evenly distributed on the circumference of the jet pipe.

Further, the output shaft and the intake shaft are respectively rotatably mounted on the stator through bearings.

Further, the outer wall of the straight pipe is in close contact with the inner wall of the first cavity, and there is a gap for rotation between them.

Further, the power machine also includes an air intake pipe, and the air intake shaft of the rotor is rotatably connected to the air outlet of the air intake pipe.

Further, the intake shaft of the rotor is connected with the air outlet of the intake pipe through a rotary joint.

According to the low-pressure jet power machine of the above-mentioned embodiment, since the stator is provided with two cavities, the rotor is installed in the inner cavity of the stator, and the air jet pipe in the rotor is provided with an expansion cavity that changes from small to large and an injection cavity that changes from large to small. After the low-temperature steam enters the jet pipe, it first decompresses and expands, and the expanded low-pressure steam is then compressed and ejected from the jet nozzles around the jet pipe along the tangential direction to another cavity of the stator. The pressure difference in the cavity will accelerate the rotation of the rotor, so that low-quality steam and other low-quality media introduced into the low-pressure jet power machine can also drive the output shaft to output work, which can recycle low-quality media and save energy.

Description of drawings

Fig. 1 is an axial sectional view of a low-pressure jet power machine in an embodiment;

Fig. 2 is a radial sectional view of a low-pressure jet power machine in an embodiment;

The reference signs are: 1-stator, 11-first cavity, 12-second cavity, 13-louver, 2-rotor, 21-output shaft, 22-jet pipe, 221-expansion cavity, 222 injection cavity , 223-air guide head, 224-jet nozzle, 23-intake shaft, 3-bearing, 4-intake pipe, 5-rotary joint.

Detailed ways

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

This embodiment provides a low-pressure jet power machine. This power machine is mainly designed for driving by low-temperature steam. The driving medium can also use other low-quality media such as water vapor or compressed air. Of course, this power machine is suitable for driving by high-quality media such as high-temperature steam. .

As shown in Figures 1 and 2, the low-pressure jet power machine provided by this embodiment mainly includes a stator 1 and a rotor 2, the stator 1 is used for installation and fixation, the rotor 2 is rotatably installed on the stator 1, and one end of the rotor 2 is air-intake , and the other end is the output shaft.

Specifically, the inside of the stator 1 is provided with a first cavity 11 and a second cavity 12. As shown in the figure, the upper end of the first cavity 11 is a conical cavity, and the lower end is a cylindrical cavity, and the centerlines of the upper and lower cavities are aligned. The second cavity 12 surrounds the first cavity 11, that is, the first cavity 11 and the second cavity 12 are separated by a partition in the middle, and the lower end between the first cavity 11 and the second cavity 12 An annular air vent is provided to make the communication between the first cavity 11 and the second cavity 12 possible. The second cavity 12 is a collection cavity, and is provided with an exhaust port 121, and the exhaust port 121 is connected with the outside world, and is used for discharging the used steam from the power machine.

In other embodiments, the exhaust port 121 may be connected to other equipment through pipelines, such as gas collection equipment, to collect and recycle the used gas for reuse.

In this embodiment, the rotor 2 includes an output shaft 21, an air injection pipe 22 and an air intake shaft 23, and the output shaft 21, the air injection pipe 22 and the air intake shaft 23 can be integrated or fixed together by welding.

The rotor 2 is rotatably mounted on the stator 1 through the output shaft 21 and the intake shaft 23. Preferably, bearings 3 are mounted on the upper and lower side walls of the first cavity 11 of the stator 1. The output shaft 21 of the rotor 2 and the The intake shaft 23 is installed on the bearing 3 respectively, and the output shaft 21 and the intake shaft 23 pass through the bearing 3 and are exposed outside the stator 1 respectively. The output shaft 21 is used for output power, and the intake shaft 23 is a tube shaft. Air shaft 23 is provided with an air inlet. The jet pipe 22 of the rotor 2 is located in the first cavity 11 as a whole.

The jet pipe 22 is a Laval nozzle, and the jet pipe 22 is spliced by a conical pipe and a straight pipe. In the conical pipe, there is an expansion cavity 221 in a conical structure, and the small mouth end (the upper end of the figure) of the expansion cavity 221 is connected to the The air intake holes of the air intake shaft 23 are butted together, and the expansion chamber 221 gradually expands along the airflow direction. The upper end of the straight pipe is docked with the lower end of the conical pipe, and the lower end of the straight pipe is a closed end, and an air guide head 233 is arranged inside the closed end, and the air guide head 233 extends from the end to the conical pipe direction (upward in the figure), and The air guiding head 233 gradually shrinks upwards from the circular surface of the end of the straight pipe, so that the straight pipe and the air guiding head 233 form an injection chamber 222 that gradually decreases towards the surroundings. The injection chamber 222 and the expansion chamber 221 form a guide. through cavity.

The sidewall circumference of the closed end of the straight pipe (the lower end shown in the figure) is provided with three evenly distributed air nozzles 224, and the air nozzles 224 are opposite to the annular air vent between the first cavity 11 and the second cavity 12, so that The gas sprayed by the gas nozzle 224 can be discharged into the second cavity 12 . The air nozzle 224 is arranged along the tangential direction, so that the air flow is ejected along the tangential direction of the outer circumference of the air nozzle 22, so as to increase the driving force. The jet tube 22 is arranged to gradually shrink along the jetting direction of the airflow, so as to increase the jetting force of the airflow.

The size of the air jet pipe 22 is determined according to the intake pressure and the temperature of the condensate chamber (second cavity 12). The higher the intake pressure, the lower the temperature of the condensate chamber. The temperature of the condensate chamber is determined by the external cooling temperature. When the temperature is low, the pressure of the condensate chamber is negative pressure. The pressure difference formed between the intake pressure and the pressure of the condensate chamber is the power for the airflow to be ejected from the air nozzle 224 at high speed. Bigger, greater output.

In other embodiments, four, six or other numbers of air nozzles 224 can be set, and can be rotated according to the required driving force.

In this embodiment, the annular vent between the first cavity 11 and the second cavity 12 is covered with side-by-side louvers 13, so that the air nozzle 224 can spray gas onto the louvers 13 during the rotation process. . In addition, the louvers 13 are deflected at a preset angle along the axial direction of the air jet pipe 22 so that the blades of the louvers 13 are opposite to the airflow ejected from the air nozzle 224 to form an ejection support. The shutters 13 covered with a certain angle have the following functions: one is to form a rigid support for the gas ejected from the air nozzle 224, and generate a greater reaction force to push the air injection pipe 22 to rotate; the other is to guide the ejected gas The function of is that the gas ejected from the air nozzle 224 quickly enters the second cavity 12 to prevent the formation of turbulent flow after ejection; the third is to form an isolation for the air flow and maintain a small pressure drop.

In order to improve the injection driving force, the outer wall of the straight pipe of the air injection pipe 22 and the inner wall of the first cavity 11 are close together, and there is a gap for rotation between the two, so as to improve the reaction force between the louver 13 and also It is ensured that the gas ejected from the gas injection nozzle 224 is guided into the second cavity 12 .

The power machine of the present embodiment also includes an air inlet pipe 4, and the air inlet pipe 4 has an air inlet and an air outlet, and the air inlet shaft 23 of the rotor 2 is connected with the air outlet of the air inlet pipe 4 through the rotary joint 5, so that the air inlet shaft 23 can be relatively advanced. Trachea 4 rotates.

The working principle of the power machine of this embodiment is: low-temperature steam enters from the intake pipe 4, enters the expansion chamber in the jet pipe 22 through the intake shaft 23, the gas decompresses and expands in the expansion chamber, the volume of the steam increases, and the pressure decreases , the temperature decreases, and the expanded low-pressure steam enters the injection chamber, moves to the surroundings of the injection chamber, and is ejected after being accelerated from the surrounding air nozzles 224. Ejecting, the air nozzles 224 are equally divided on the outer circle, and the gas ejected from each air nozzle 224 forms an equal driving force, which promotes the rotation of the air injection pipe 22, and the air injection pipe 22 drives the output shaft 21 to rotate and output work.

In the low-pressure jet power machine of the present embodiment, since the stator 1 is provided with two cavities, the rotor 2 is installed in the inner cavity of the stator, and the jet tube 22 in the rotor 2 is provided with an expansion cavity 221 that changes from small to large and a cavity that changes from large to large. The small injection chamber 222 makes the low-temperature steam enter the air injection pipe 22 and first depressurizes and expands. The expanded low-pressure steam is then compressed and ejected from the air injection nozzle 224 around the air injection pipe 22 along the tangential direction to another cavity of the stator. The injection force of the nozzle 224 and the pressure difference in the two cavities of the stator 2 will accelerate the rotation of the rotor, so that the low-pressure jet power machine introduces low-quality medium such as low-temperature steam and can also drive the output shaft to output work, and the low-quality medium can be recycled. Energy saving.

The above uses specific examples to illustrate the present invention, which is only used to help understand the present invention, and is not intended to limit the present invention. For those skilled in the technical field to which the present invention belongs, some simple deduction, deformation or replacement can also be made according to the idea of the present invention.

Claims (10)

1. A low-pressure jet power machine, characterized in that, comprises a stator and a rotor; The inside of the stator is provided with a first cavity and a second cavity, the first cavity is located in the middle, the second cavity is arranged around the first cavity, the first cavity and the second cavity An annular air vent is provided between the bodies, and the second cavity is provided with an exhaust port that communicates with the outside world; The rotor includes an output shaft, an air jet pipe and an air inlet shaft. The output shaft and the air inlet shaft are located at both ends of the air jet pipe. One end of the air jet pipe is provided with an air inlet, and the other end is a closed end. The side wall of the end is provided with a plurality of evenly distributed air nozzles tangent to the circumferential surface, and the expansion chamber and the injection chamber connected to each other are arranged in the air injection pipe along the air intake direction, and the expansion chamber is gradually enlarged. The injection chamber is differentiated and gradually reduced to the surroundings, the small opening of the expansion chamber is connected to the air inlet, and the narrowed end of the injection chamber is connected to the air nozzle; the rotor is rotatably installed on the On the stator, the air injection pipe is located in the first cavity, and the air nozzle of the air injection pipe is arranged opposite to the air vent between the first cavity and the second cavity. 2. The low-pressure jet power machine according to claim 1, wherein the jet pipe comprises a conical pipe and a straight pipe, and the straight pipe is docked with the large mouth end of the conical pipe, and there is a gradually expanding expansion in the conical pipe. cavity, the end of the straight pipe is sealed, and an air guide head is provided inside the closed end, and the outer diameter of the air guide head gradually decreases toward the direction of the conical pipe, and the straight pipe and the inner air guide head An injection cavity that differentiates and gradually shrinks from the middle to the periphery is formed; the air inlet of the air injection pipe is arranged on the conical pipe, and the air nozzle of the air injection pipe is arranged on the side wall of the straight pipe. 3. The low-pressure jet power machine according to claim 2, characterized in that, the air nozzle is gradually reduced along the jet direction. 4. The low-pressure jet power machine according to claim 3, characterized in that the annular air vent between the first cavity and the second cavity is covered with side-by-side louvers. 5. The low-pressure jet power machine as claimed in claim 4, wherein the blades of the louvers are deflected at a preset angle along the axial direction of the jet tube, so that the blades of the louvers are opposite to the airflow ejected from the jet nozzle, Form jet supports. 6. The low-pressure jet engine according to claim 5, characterized in that there are three air nozzles, which are evenly distributed on the circumference of the jet pipe. 7. The low-pressure jet power machine according to claim 5, wherein the output shaft and the intake shaft are respectively rotatably mounted on the stator through bearings. 8 . The low-pressure jet engine according to claim 5 , wherein the outer wall of the straight pipe is in close contact with the inner wall of the first cavity, and there is a gap for rotation between the two. 9. The low-pressure jet power machine according to any one of claims 1 to 8, further comprising an air intake pipe, the air intake shaft of the rotor is rotatably connected to the air outlet of the air intake pipe. 10. The low-pressure jet power machine according to claim 5, characterized in that, the intake shaft of the rotor is connected with the air outlet of the intake pipe through a rotary joint.