CN203848335U - Two-stage axial blade-type cyclone machine - Google Patents

Abstract

The utility model discloses a two-stage axial vane type swirler, which comprises a coaxially arranged cylinder body, an outer hub, an inner hub and a slit cylinder arranged in sequence from outside to inside, wherein the inner wall of the cylinder The gap between the outer peripheral wall of the outer hub and the outer peripheral wall is provided with a plurality of outer swirl blades to form an outer flow channel, and the gap between the inner wall of the outer hub and the outer wall of the inner hub is provided with a plurality of inner swirl blades to form an inner flow channel; The slotted cylinder is set in the inner hub and its diameter is equal to the inner diameter of the inner hub. The slotted cylinder has an axial central through hole and the slotted cylinder is circumferentially opened along the outer circumference of the central through hole. A plurality of axial through holes are used as axial direct current through holes, and the fuel injection nozzle base is sleeved in the central through hole of the slotted cylinder. The cyclone of the utility model can improve the atomization quality of fuel oil, strengthen turbulent flow mixing, and reduce exhaust pollution. More importantly, it helps to strengthen the combustion of mainstream fuel, which can improve ignition conditions, stabilize combustion, and improve the efficiency of the combustion chamber. Working conditions.

Description

A Two-Stage Axial Vane Cyclone

technical field

The utility model belongs to the field of swirl burners, in particular to a two-stage axial vane type swirl.

Background technique

Swirl combustion is an effective means of intensifying combustion, and the swirler is an important device to realize swirl combustion. The swirler is one of the most important parts of the swirl combustor, and its performance directly affects the work and performance of the combustor.

Due to the recirculation zone created by the strongly swirling airflow, the mixture of unburned fuel and air entering the flame tube can be ignited smoothly. The swirl combustor has the advantages of compact structure, short flame length, good combustion stability, high combustion efficiency and low pollutant emission. As one of the key components of the swirl combustor, the swirler has a direct impact on the working performance of the combustor.

Tissue combustion in the head of the combustion chamber is an aspect that deserves to be studied intensively. Over the decades, due to the need to reduce smoke and widen the stable working range, the number of stages of head cyclone has been developed from single stage to double stage. Among them, the two-stage cyclone is a new type of cyclone. Its main functions are: (1) Make the air flow rotate to generate centrifugal force to form a recirculation zone and improve flame stability. (2) The high-speed rotating jet increases the relative velocity between the airflow and the oil droplets, which can improve the quality of fuel atomization and the formation of mixed gas, and improve the combustion efficiency. (3) Different airflow velocities at the outlets of the two-stage cyclone can enhance turbulent mixing and reduce exhaust pollution.

Figure 1 shows a two-stage axial swirler in the prior art, the air flow can generate tangential velocity at the outlet after passing through the outer flow channel and the inner flow channel, and the direction of rotation is opposite, so that Increasing the relative velocity between the airflow and the oil droplets can improve the quality of fuel atomization, and in addition, a recirculation zone opposite to the velocity of the main flow can appear behind the swirler. However, this swirler in the prior art also has many shortcomings, such as the improved atomized fuel being brought around by strong turbulence and cannot enter the central combustion zone well, and the time for the mixture to stay in the recirculation zone Short, not conducive to the stability of the flame and efficient combustion.

Utility model content

The purpose of this utility model is to provide a two-stage axial vane swirler for the deficiencies of the prior art, which improves the atomization of fuel oil by setting coaxially arranged bipolar swirl channels and combining direct-flow through holes quality, strengthen swirl combustion, improve combustion efficiency, and reduce exhaust pollution.

For realizing the above object, the technical scheme that the utility model adopts is:

A two-stage axial vane swirler, including a coaxially arranged cylinder, an outer hub, an inner hub and a slotted cylinder that are sequentially fitted from the outside to the inside, wherein,

The gap between the inner wall of the cylinder and the outer peripheral wall of the outer hub is provided with a plurality of external swirl vanes, thereby forming an outer flow channel; the gap between the inner wall of the outer hub and the outer wall of the inner hub is provided with a plurality of inner swirl blades blades, and thereby form an inner flow channel; the slotted cylinder is sleeved in the inner ring hub and its diameter is equal to the inner diameter of the inner ring hub, the slotted cylinder has an axial center through hole and the slotted The cylinder is provided with a plurality of axial through holes in the circumferential direction along the outer periphery of the central through hole as axial direct flow through holes, and the center through hole of the slotted cylinder is fitted with a nozzle base.

As an improvement of the utility model, the two axial edges of the outer swirl vane are respectively connected and fixed to the inner wall of the cylinder and the outer peripheral wall of the outer hub.

As an improvement of the utility model, the axial end surfaces of the outer swirl blades are respectively in the same plane as the two end surfaces of the fuel injector base.

As an improvement of the utility model, the blade inclination angle of the outer swirl blade is 45°

As an improvement of the utility model, the two axial edges of the inner swirl blade are respectively connected and fixed to the inner peripheral wall surface of the outer hub and the outer peripheral wall surface of the inner hub.

As an improvement of the utility model, the axial end surfaces of the inner swirl blades are respectively in the same plane as the two end surfaces of the fuel injector base.

As an improvement of the utility model, the blade inclination angle of the inner swirl blade is 30°.

As an improvement of the utility model, there are 12 outer swirl blades.

As an improvement of the utility model, there are 12 internal swirl blades.

As an improvement of the utility model, the number of slotted direct current holes of the slotted cylinder is six.

The high-efficiency slotted two-stage axial vane cyclone of the utility model rationally arranges part of the direct-flow holes around the center of the cyclone and feeds the direct-flow air, so that the area of the recirculation zone is obviously enlarged and the recirculation zone is reduced. Negative pressure weakens the filling effect of the mainstream, reduces the turbulence intensity of the wake, and moves the confluence point of the mainstream backward, resulting in a longer recirculation zone, thereby increasing the residence time of fuel in the recirculation zone, improving the atomization effect, and intensifying combustion. ; Especially a small amount of oil mist forms a duty flame that is not easy to extinguish in the high-temperature, low-speed recirculation zone, which enhances the stability of the flame and improves the combustion efficiency. Fluid losses are also reduced due to the reduced turbulence intensity. At the same time, near the wall of the flame tube, the temperature of the combustion chamber of the swirler with the direct-flow hole is lower than that of the combustion chamber of the swirler without the direct-flow hole, which is very beneficial to the cooling of the wall of the combustion chamber.

Compared with the traditional two-stage swirler combustor, the high-efficiency slotted two-stage axial vane swirler combustor has better fuel atomization effect, higher combustion temperature, and significantly larger high-temperature area, so The capacity of the combustion chamber with the swirler with the direct current hole is larger, and the combustion efficiency is also higher. In addition, compared with the swirler combustor without direct-flow holes, the high-temperature section of the swirler combustor with direct-flow holes is moved backward at the outlet of the swirler, which prevents the swirler and nozzle from being burned. Through this design, the utility model realizes enhanced combustion, stabilizes the flame, and obtains higher combustion efficiency.

Description of drawings

Fig. 1 is the three-dimensional structural diagram of two-stage axial swirler in the prior art;

Fig. 2 is a partial structural diagram of a two-stage axial vane cyclone according to an embodiment of the present invention;

Fig. 3 is a three-dimensional structure diagram of a two-stage axial vane swirler according to an embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model will be further described. It should be noted here that the descriptions of these implementations are used to help understand the utility model, but are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

As shown in Figures 2 and 3, the utility model provides an axial vane type two-stage swirler with a direct current hole, including a cylinder wall 1, an outer ring hub 3, an inner ring hub 5, and a nozzle base 6 , a slotted cylinder 7, several outer swirl blades 2 and inner swirl blades 4, the several outer swirl blades 2 are evenly installed in the outer flow channel 9 formed between the cylinder wall 1 and the outer ring hub 3, If the inner swirl blades 4 are installed between the outer hub 3 and the inner hub 5 to form an inner flow channel 10, the slotted cylinder 7 is set in the inner hub 5, and the slotted cylinder 7 The diameter of the inner ring hub 5 is preferably equal to the inner diameter of the inner ring hub 5. The nozzle base 6 is solid in the central axial through hole of the slotted cylinder 7. The cylinder wall 1, the outer ring hub 3, and the inner ring hub 5 , the nozzle base 6 and the slotted cylinder 7 have the same central axis 8 .

Preferably, there are 12 outer swirl blades 2, but the number of outer swirl blades is not limited in the present invention. The 12 outer swirl blades 2 in this embodiment are evenly installed between the cylinder wall 1 and the outer ring hub 3 , and the outer swirl blades 2 are positioned radially around the central axis 8 . One side of each outer swirl vane 2 is connected with the cylinder wall 1 , and the other side is connected with the outer ring hub 3 . The intersecting lines between the blade and the cylinder wall 1 and the outer peripheral surface of the blade and the outer ring hub 3 form two spatial curves.

Preferably, there are 12 inner swirl blades 4, but the utility model does not limit the number of inner swirl blades. The 12 inner swirl blades 4 in this embodiment are evenly installed between the outer ring hub 3 and the inner ring hub 5 , and the inner swirl blades 4 are positioned radially around the central axis 8 . One side of each inner swirl blade 4 is connected with the outer ring hub 3 , and the other side is connected with the inner ring hub 5 .

Preferably, the two end faces of the outer swirl vane 2 and the inner swirl vane 4 are respectively in the same plane as the two end faces of the fuel injector base 6 .

Preferably, the slotted cylinder 7 has six slotted direct current holes, and the six slotted direct current holes are evenly distributed around the slotted cylinder 7 . Of course, more or fewer DC holes can also be selected according to actual needs.

Preferably, the blade inclination angles of the outer swirl blades 2 and the inner swirl flow 4 reach 45° and 30°, that is, the airflow inlet velocity angle of the outer swirl blade 2 is 90°, and the airflow outlet velocity angle is 45°, The airflow inlet velocity angle of the inner swirl blade 4 is 90°, and the airflow outlet velocity angle is -30°. However, the inclination angles of the outer swirl blades 2 and the inner swirl 4 in the present invention are not limited to the specific values in the above embodiments, and can be selected according to actual needs.

Under the condition of keeping the existing structure basically unchanged, the utility model evenly punches some direct current holes along the circumferential direction around the slit cylinder 7 to introduce a certain amount of direct current wind. The addition of DC wind changes the reverse pressure gradient in the recirculation zone, which changes the shape of the recirculation zone and brings about a series of performance improvements.

The high-efficiency slotted two-stage axial vane cyclone of the utility model reasonably arranges part of the slotted direct-flow holes around the center of the cyclone and feeds the direct-flow air. This part of the airflow will entrain a small amount of oil mist and enter the backflow area for combustion. , contribute to the combustion enhancement of mainstream fuels. At the same time, the addition of central air can make the flame move closer to the center, eliminating the problem of low temperature at the center caused by backflow, improving the ignition conditions, stabilizing combustion, and improving the working conditions of the combustion chamber. In addition, the swirling airflow entering the internal and external swirl channels can also better mix fuel and air, strengthen turbulent mixing, and stronger swirl strength, which makes the role of central wind more obvious, so it not only improves fuel atomization quality and Mixed gas is formed, and the ignition conditions are further improved, combustion is stabilized, combustion efficiency is improved, and exhaust pollution is reduced.

The above description is only a preferred embodiment of the utility model, but the utility model should not be limited to the content disclosed in the embodiment and accompanying drawings. Therefore, all equivalents or modifications that do not deviate from the spirit disclosed by the utility model fall within the protection scope of the utility model.

Claims (10)

1. a twin-stage bladed axial swirler, comprises cylindrical shell (1), outer wheel hub (3), inner wheel hub (5) and the cylinder that cracks (7) coaxially arranged and that be set with successively from outside to inside, wherein,

Space between described cylindrical shell (1) inwall and outer wheel hub (3) periphery wall is provided with multiple outer swirl vanes (2), thereby and form outer flow passage; Space between described outer wheel hub (3) inwall and inner wheel hub (5) outside wall surface is provided with multiple inward eddy blades (4), thereby and form inner flow passage; The described cylinder that cracks (7) is sleeved in described inner wheel hub (5) and its diameter equates with the internal diameter of inner wheel hub (5), this cylinder that cracks (7) has axial central through hole and this cylinder that cracks (7) along this central through hole periphery along circumferentially to having multiple axially extending bores as axial DC through hole, described in crack in the described central through hole of cylinder (7) and be set with atomizer pedestal (6).

2. a kind of twin-stage bladed axial swirler according to claim 1, wherein, the two edges on described outer swirl vane (2) is axial are connected and fixed with cylindrical shell (1) inwall and outer wheel hub (3) periphery wall respectively.

3. a kind of twin-stage bladed axial swirler according to claim 2, wherein, described outer swirl vane (2) axial end respectively with the axial two end faces of atomizer pedestal (6) in same plane.

4. a kind of twin-stage bladed axial swirler according to claim 3, wherein, the blade tilt of described outer swirl vane (2) is 45 °.

5. according to a kind of twin-stage bladed axial swirler described in any one in claim 1-4, wherein, the two edges of described inward eddy blade (4) on are axially connected and fixed with outer wheel hub (3) internal perisporium face and inner wheel hub (5) periphery wall respectively.

6. a kind of twin-stage bladed axial swirler according to claim 5, wherein, described inward eddy blade (4) axial end respectively with the axial two end faces of atomizer pedestal (6) in same plane.

7. a kind of twin-stage bladed axial swirler according to claim 6, wherein, the blade tilt of described inward eddy blade (4) is 30 °.

8. according to a kind of twin-stage bladed axial swirler described in any one in claim 1-4, wherein, described outer swirl vane (2) is 12.

9. according to a kind of twin-stage bladed axial swirler described in any one in claim 1-4, wherein, described inward eddy blade (4) is 12.

10. according to a kind of twin-stage bladed axial swirler described in any one in claim 1-4, wherein, described in the crack direct current hole count of cracking of cylinder (7) be six.