阅读说明：本技术 可调整角度的蜗壳隔舌组件及燃油离心泵 (But angle of adjustment's spiral case spacer tongue subassembly and fuel centrifugal pump ) 是由 晁文雄 曹庆年 金文� 陈万强 李祥阳 范文雯 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种可调整角度的蜗壳隔舌组件及燃油离心泵,包括蜗壳本体和隔舌,所述隔舌以可转动的方式安装于蜗壳本体内,所述隔舌的转动轴线平行于蜗壳本体进口轴线；本发明的蜗壳隔舌组件可提高离心泵在不同过流量工况下的效率,提高离心泵的能效值,而且通过上述角度调整可减小离心泵出口压力值脉动幅度,高频脉动成分减小,作用于蜗壳上的径向力数值和脉动幅度减小。(The invention discloses a volute partition tongue assembly with an adjustable angle and a fuel centrifugal pump, comprising a volute body and a partition tongue, wherein the partition tongue is rotatably arranged in the volute body, and the rotating axis of the partition tongue is parallel to the inlet axis of the volute body; the volute partition tongue assembly can improve the efficiency of the centrifugal pump under different over-flow working conditions, improve the energy efficiency value of the centrifugal pump, reduce the pulsation amplitude of the outlet pressure value of the centrifugal pump through the angle adjustment, reduce high-frequency pulsation components, and reduce the radial force value and the pulsation amplitude acting on the volute.)

1. The utility model provides an angle adjustable's spiral case partition tongue subassembly which characterized in that: the volute comprises a volute body and a partition tongue, wherein the partition tongue is rotatably arranged in the volute body, and the rotation axis of the partition tongue is parallel to the inlet axis of the volute body.

2. The adjustable angle volute tongue assembly of claim 1, wherein: the volute comprises a volute body and is characterized by further comprising a rotating shaft arranged in parallel with the inlet axis of the volute body, the rotating shaft is installed in the volute body in a rotating matching mode, the partition tongue is in transmission matching with the rotating shaft, one end of the rotating shaft penetrates through the side wall of the volute body to extend to the outer side of the volute body to form a driving end connected with external driving equipment, and the driving end is in rotating sealing matching with the volute body.

3. The adjustable angle volute tongue assembly of claim 2, wherein: the volute body is internally provided with baffle sheets which are positioned at two sides of the baffle tongue and used for limiting the rotation angle of the baffle tongue.

4. The adjustable angle volute tongue assembly of claim 2, wherein: the spiral case comprises a spiral case body and is characterized by further comprising a pressing plate, a radially extending limiting disc is arranged at the position, close to the outer circle of the driving end, of the rotating shaft, an inwards concave limiting groove is formed in the outer wall of the spiral case body and is in running fit with the limiting disc, and the pressing plate is fixed on the outer wall of the spiral case body and presses the limiting disc in the limiting groove to achieve axial positioning of the rotating shaft.

5. The adjustable angle volute tongue assembly of claim 2, wherein: and the excircle of the driving end of the rotating shaft is in pressure-bearing seal with the side wall of the volute body through a seal ring.

6. The adjustable angle volute tongue assembly of claim 1, wherein: the radial section of the far end of the separation tongue is in circular arc transition.

7. The adjustable angle volute tongue assembly of claim 2, wherein: the thickness of the separation tongue gradually increases from the far end to the near end, and the near end of the separation tongue is sleeved on the rotating shaft and is in transmission fit with the rotating shaft.

8. A fuel centrifugal pump, characterized by: the centrifugal pump is provided with the angle-adjustable volute partition tongue assembly as claimed in any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of fluid machinery, in particular to a volute partition tongue assembly with an adjustable angle and a fuel centrifugal pump.

Background

The volute partition tongue of the existing centrifugal pump keeps a certain opening angle and is directly fixed in the volute to be integrated with the volute. The civil centrifugal pump is single in working state and runs under rated working conditions, and is always in a high-efficiency area, but for the aviation centrifugal pump, the civil centrifugal pump belongs to a high-speed and high-pressure fuel centrifugal pump, the working conditions are more and variable, the running time of the minimum working condition is long, and the flow is one third of the rated point flow. The engine is switched continuously from large flow to small flow, so that the fuel centrifugal pump works under a multi-working condition state and cannot operate in an optimal efficiency range all the time, the fuel consumption rate is increased, and the cost is increased.

In order to solve the problems, a volute partition tongue assembly with an adjustable angle and a fuel centrifugal pump are needed, so that the service efficiency of the volute is improved.

Disclosure of Invention

In view of the above, the present invention provides an angle-adjustable volute partition tongue assembly and a fuel centrifugal pump, wherein the rotation angle of the partition tongue can be adjusted by the partition tongue according to different working conditions, so that the fuel centrifugal pump operates in a high efficiency region. .

The volute partition tongue assembly with the adjustable angle comprises a volute body and partition tongues, wherein the partition tongues are rotatably arranged in the volute body, and the rotating axes of the partition tongues are parallel to the inlet axis of the volute body.

Further, still include the pivot with volute body import axis parallel arrangement, pivot normal running fit installs in the volute body, the separation tongue cooperates with the pivot transmission, pivot one end is passed the volute body lateral wall and is extended the volute body and form the drive end that is used for being connected with external drive equipment outward, and this drive end and the sealed cooperation of spiral case body rotation.

Furthermore, the volute body is internally provided with blocking pieces which are positioned at two sides of the partition tongue and used for limiting the rotation angle of the partition tongue.

The volute comprises a volute body and a rotating shaft, wherein the outer circle of the rotating shaft is close to the driving end, the rotating shaft is provided with a limiting disc extending in the radial direction, the outer wall of the volute body is provided with a limiting groove which is concave and is in running fit with the limiting disc, and the pressing plate is fixed on the outer wall of the volute body and presses the limiting disc in the limiting groove to realize axial positioning of the rotating shaft.

Furthermore, the outer circle of the driving end of the rotating shaft and the side wall of the volute body are sealed in a pressure-bearing mode through a sealing ring.

Further, the radial section of the far end of the separation tongue is in circular arc transition.

Furthermore, the thickness of the separation tongue gradually increases from the far end to the near end, and the near end of the separation tongue is sleeved on the rotating shaft and is in transmission fit with the rotating shaft.

The invention also provides a fuel centrifugal pump which is provided with the volute casing partition tongue assembly with the adjustable angle.

The invention has the beneficial effects that:

when the flow of the fuel centrifugal pump is in a rated flow state, the separation tongue is positioned at a reference angle theta, so that the whole fuel centrifugal pump operates in a high-efficiency public condition area; when the aircraft engine is in a cruising state, the flow of the fuel centrifugal pump is in a small flow state, and at the moment, the partition tongue swings to the side of the diffusion section to adjust the angle to theta 1, so that the situation that partial fuel oil caused by flowing in the wide flow channel flows back to the inlet of the diffusion section of the volute to block the flow channel according to the volute body designed according to the rated flow can be prevented, the phenomena of secondary flow, vortex, backflow and the like are avoided, the volume loss and the hydraulic loss of the fuel centrifugal pump are avoided, and the efficiency of the fuel centrifugal pump under the working condition is improved; when the aircraft engine is in a climbing or chasing state, the flow of the fuel centrifugal pump is in a large-flow state, the isolating tongue swings to an angle theta 2 to the side far away from the diffusion section at the moment, the angle adjustment can prevent a volute body designed according to the rated flow, partial fuel cannot enter an inlet of the volute diffusion section in time when the flow is large, the formation of local high-speed flow and a local low-pressure area in the volute body is avoided, the cavitation phenomenon is avoided, and the re-backflow of partial fuel can be avoided, so that the phenomena of secondary flow, vortex, backflow and the like are avoided, and the volume loss and the hydraulic loss are avoided; the structure can improve the efficiency of the centrifugal pump under different over-flow working conditions, improve the energy efficiency value of the centrifugal pump, reduce the pulsation amplitude of the outlet pressure value of the centrifugal pump through the angle adjustment, reduce high-frequency pulsation components, and reduce the radial force value and the pulsation amplitude acting on the volute.

Drawings

The invention is further described below with reference to the figures and examples.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of point C of FIG. 1;

FIG. 3 is a side cross-sectional structural view of FIG. 1;

FIG. 4 is a cross-sectional axial view of FIG. 1;

FIG. 5 is an enlarged view of point D in FIG. 4 (the tongue is rotated to an angle of θ °;

FIG. 6 is an enlarged view of point D in FIG. 4 (the tongue is rotated to an angle of θ 1 °);

FIG. 7 is an enlarged view of point D in FIG. 4 (the tongue is rotated to an angle of θ 2 °);

FIG. 8 is a schematic view of a mounting structure of the partition;

FIG. 9 is an enlarged view of point E in FIG. 8;

Detailed Description

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of point C of FIG. 1; FIG. 3 is a side cross-sectional structural view of FIG. 1; FIG. 4 is a cross-sectional axial view of FIG. 1; FIG. 5 is an enlarged view of point D in FIG. 4 (the tongue is rotated to an angle of θ °; FIG. 6 is an enlarged view of point D in FIG. 4 (the tongue is rotated to an angle of θ 1 °); FIG. 7 is an enlarged view of point D in FIG. 4 (the tongue is rotated to an angle of θ 2 °); FIG. 8 is a schematic view of a mounting structure of the partition; FIG. 9 is an enlarged view of point E in FIG. 8;

as shown in the figure: the volute partition tongue assembly with the adjustable angle comprises a volute body 1 and partition tongues 2, wherein the partition tongues are rotatably mounted in the volute body, and the rotating axes of the partition tongues are parallel to the inlet axis of the volute body.

Referring to fig. 1 to 4, the volute body has an inlet a and an outlet B, wherein the axis of the inlet a is perpendicular to the axis of the outlet B, the partition tongue is installed near the outlet of the volute body and isolated between the spiral line segment of the volute body and the diffuser, wherein the diffuser is connected to the outlet B via the spiral line segment, the spiral line segment is used for installing the impeller and is communicated with the inlet a, and the installation position of the partition tongue is the same as that of the existing structure, and thus details are not repeated;

in fig. 5, a line F is a horizontal reference line parallel to the volute outlet, a line G is a central axis of the partition tongue, an included angle between the line F and the line G in fig. 5 is θ, an included angle between the line F and the line G in fig. 6 is θ 1, and an included angle between the line F and the line G in fig. 7 is θ 2, where θ 1 and θ 2 are respectively a positive angle and a negative angle, and as shown in fig. 5, when the flow rate of the fuel centrifugal pump is in a rated flow rate state, the partition tongue is at a reference angle θ, so that the entire fuel centrifugal pump operates in a high-efficiency public condition region; as shown in fig. 6, when the aircraft engine is in a cruising state, the flow rate of the fuel centrifugal pump is in a small flow rate state, and at the moment, the partition tongue swings to the side of the diffusion section to adjust the angle to the theta 1 position, so that the volute body designed according to the rated flow rate can be prevented, partial fuel oil caused by flowing in the wide flow channel in the small flow rate state flows back to the inlet of the diffusion section of the volute to block the flow channel, secondary flow, vortex, backflow and other phenomena are avoided, the volume loss and the hydraulic loss of the fuel centrifugal pump are avoided, and the efficiency of the fuel centrifugal pump under the working condition is improved; as shown in fig. 7, when the aircraft engine is in a state of climbing or chasing, the flow rate of the fuel centrifugal pump is in a large flow rate state, and at the moment, the isolating tongue swings to an angle θ 2 away from the diffusion section side, the angle adjustment can prevent a volute body designed according to the rated flow rate from being adjusted, and when the flow rate is large, part of fuel cannot enter an inlet of the volute diffusion section in time, so that a local high-speed flow and a local low-pressure area are prevented from being formed in the volute body, the cavitation phenomenon is avoided, and the phenomenon of secondary flow, vortex, backflow and the like can be avoided, so that the volume loss and the hydraulic loss are avoided; the angles theta, theta 1 and theta 2 are adjusted according to the flow working condition of the actual fuel centrifugal pump, wherein the angles theta 1 and theta 2 are continuously adjusted according to different flow working conditions, the structure can improve the efficiency of the centrifugal pump under different flow working conditions and improve the energy efficiency value of the centrifugal pump, the pulsation amplitude of the outlet pressure value of the centrifugal pump can be reduced through the angle adjustment, the high-frequency pulsation component is reduced, and the radial force value and the pulsation amplitude acting on the volute are reduced.

In this embodiment, still include the pivot 3 with volute body import axis parallel arrangement, pivot normal running fit installs in the volute body, the separation tongue is with pivot transmission fit, pivot one end passes the volute body lateral wall and extends the volute body and form the drive end that is used for being connected with external drive equipment outward, and this drive end and the sealed cooperation of spiral case body rotation. Referring to fig. 8 and 9, the rotation shaft is disposed to facilitate the control and adjustment of the isolation tongue, two side walls inside the volute body may be recessed to form a bearing seat, the rotation shaft is mounted on the bearing seat through two bearings in a transmission fit manner, one end of the rotation shaft is disposed outside the volute body to form a driving end, the driving end may be disposed with an internal spline structure or an internal square hole structure to facilitate the transmission fit with the power output end of a driving device, wherein the driving device may be a variable frequency motor and is matched with an encoder to achieve the precise adjustment of the rotation angle of the rotation shaft, in addition, a flow sensor may be disposed in the centrifugal pump, the detected flow data is transmitted to a control system through the flow sensor, the rotation angle of the rotation shaft is transmitted to the variable frequency motor through the analysis and calculation of the control system to achieve the driving of the variable frequency motor, thereby precisely controlling the angle of the isolation, the fuel centrifugal pump is always in a high-efficiency area under each flow working condition.

In this embodiment, the volute body is provided with blocking pieces 7 which are positioned at two sides of the partition tongue and used for limiting the rotation angle of the partition tongue. Referring to fig. 7, the rotating shaft is located between the two blocking pieces, when the rotating shaft drives the blocking tongue to rotate, the blocking tongue abuts against the two blocking pieces to limit the rotation angle of the blocking tongue, and the rotation range of the blocking tongue is accurately controlled by the two blocking pieces, so that the blocking tongue can rotate in a controllable and relatively efficient range all the time.

In this embodiment, the axial positioning device further comprises a pressing plate 5, a radially extending limiting disc 8 is arranged at a position, close to the outer circle of the driving end, of the rotating shaft, a limiting groove which is concave and is in running fit with the limiting disc is formed in the outer wall of the volute body, and the pressing plate is fixed on the outer wall of the volute body and presses the limiting disc in the limiting groove to achieve axial positioning of the rotating shaft. As shown in fig. 9, the pressing plate is fastened and connected to the outer wall of the spiral case body by a screw 4, a through hole for the driving end of the rotating shaft to pass through is formed in the pressing plate, the pressing plate presses the outer end face of the limiting disc, the axial positioning of the rotating shaft is realized by the pressing plate, and the pressing plate is attached to the limiting disc to facilitate the sealing between the spiral case bodies of the rotating shaft, wherein a sealing ring can be arranged on a joint surface between the pressing plate and the limiting disc to realize the sealing, which is not described in;

in this embodiment, the outer circle of the driving end of the rotating shaft is pressure-bearing sealed with the side wall of the volute body through a sealing ring 6. The volute body is provided with a mounting hole in the side wall, the rotating shaft is in running fit with the mounting hole, a sealing groove is formed in the excircle of the rotating shaft, the sealing ring is mounted in the sealing groove, the sealing ring is sealed between the excircle of the rotating shaft and the inner circle of the mounting hole, a plurality of sealing rings can be axially arranged on the excircle of the rotating shaft to realize pressure bearing sealing, sealing of the volute body is guaranteed through the structure, and liquid leakage can be effectively prevented.

In this embodiment, the radial cross section of the distal end of the partition tongue 2 is in arc transition. The radial direction is based on the rotating shaft, the far end is the end far away from the rotating shaft, the near end is the end close to the rotating shaft, and as shown in the combined figure 5, the far end of the circular arc transition of the separation tongue is beneficial to forming a good flow guide effect on a fluid medium.

In this embodiment, the thickness of the separation tongue gradually increases from the distal end to the proximal end, and the proximal end of the separation tongue is sleeved on the rotating shaft and is in transmission fit with the rotating shaft. As shown in the combined figure 5, the partition tongue of the structure can ensure enough strength and rigidity, and is also beneficial to the matching installation with the rotating shaft.

The embodiment also provides a fuel centrifugal pump, and the fuel centrifugal pump is provided with the volute partition tongue assembly with the adjustable angle. Referring to fig. 1, a volute partition tongue assembly with an adjustable angle is installed in the fuel centrifugal pump, and existing components such as an impeller and the like are also installed in the fuel centrifugal pump, which are not described again;

finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.