阅读说明：本技术 一种改善压气机性能用带背腔的轴线斜槽式处理机匣 (Axial line inclined groove type processing casing with back cavity for improving performance of gas compressor ) 是由 金鹏 徐宁 刘震 张舟 高思华 于 2020-04-03 设计创作，主要内容包括：一种改善压气机性能用带背腔的轴线斜槽式处理机匣,它涉及一种机匣。本发明为了解决现有的轴向斜槽处理机匣存在压气机峰值效率降低较多的问题。本发明包括外壳体(1)、环形肋(2)和轴向斜槽(3),环形肋(2)内嵌到外壳体(1)内,轴向斜槽(3)安装在环形肋(2)的内孔和外壳体(1)内,轴向斜槽(3)上以环形阵列的形式开设多个槽孔(3-1),槽孔(3-1)分别在轴向和径向上倾斜,槽孔(3-1)的轴向倾斜角度为(α),α＝10°～35°,槽孔(3-1)的径向倾斜角度为(β),β＝30°～50°,外壳体(1)和轴向斜槽(3)之间所围成的空间为背腔(B)。本发明用于改善压气机性能。(The invention relates to an axial oblique groove type processing casing with a back cavity for improving the performance of a gas compressor, which relates to a casing and aims to solve the problem that the peak efficiency of the gas compressor is reduced greatly in the conventional axial oblique groove type processing casing, the axial oblique groove type processing casing comprises an outer casing (1), an annular rib (2) and axial oblique grooves (3), wherein the annular rib (2) is embedded into the outer casing (1), the axial oblique grooves (3) are arranged in an inner hole of the annular rib (2) and the outer casing (1), a plurality of slotted holes (3-1) are formed in the axial oblique grooves (3) in an annular array mode, the slotted holes (3-1) are respectively inclined in the axial direction and the radial direction, the axial inclination angle of the slotted holes (3-1) is (α), α is 10-35 degrees, the radial inclination angle of the slotted holes (3-1) is (β), β is 30-50 degrees, and the space enclosed between the outer casing (1) and the axial oblique grooves (3) is a back cavity (B).)

1. The utility model provides an improve compressor performance with axis skewed slot formula processing machine casket of taking back of body chamber which characterized in that: it comprises an outer shell (1), an annular rib (2) and an axial chute (3), wherein the annular rib (2) is embedded into the outer shell (1), the axial chute (3) is arranged in an inner hole of the annular rib (2) and the outer shell (1),

a plurality of slotted holes (3-1) are formed in the axial inclined groove (3) in an annular array mode, the slotted holes (3-1) are respectively inclined in the axial direction and the radial direction, the axial inclination angle of the slotted holes (3-1) is (α), α is 10-35 degrees, the radial inclination angle of the slotted holes (3-1) is (β), β is 30-50 degrees, and a space enclosed between the outer shell (1) and the axial inclined groove (3) is a back cavity (B).

2. The axial skewed slot casing with back cavity for improving compressor performance as set forth in claim 1, wherein: the outer shell (1) comprises a first annular section (1-1), a second annular section (1-2) and a third annular section (1-3), wherein the first annular section (1-1), the second annular section (1-2) and the third annular section (1-3) are sequentially and coaxially arranged from left to right and are integrally manufactured.

3. The axial skewed slot casing with back cavity for improving compressor performance as set forth in claim 2, wherein: the inner apertures of the first annular section (1-1), the second annular section (1-2) and the third annular section (1-3) are reduced from left to right in sequence.

4. The axial skewed slot casing with back cavity for improving compressor performance as set forth in claim 3, wherein: the axial chute (3) is of an annular frustum structure, and the outer side walls of the air inlet section and the exhaust section of the axial chute (3) are provided with limiting connecting bulges (3-2).

5. The axial skewed slot casing with back cavity for improving compressor performance as set forth in claim 4, wherein: the inner diameter of the third annular section (1-3) is gradually reduced from left to right, and the change of the inner diameter of the third annular section (1-3) is in stable transition with the inner diameter of the annular frustum of the axial chute (3).

6. The axial skewed slot casing with back cavity for improving compressor performance as set forth in claim 5, wherein: the limiting connecting device further comprises a plurality of fasteners (4), and the limiting connecting bulge (3-2) of the axial inclined groove (3) is detachably connected with the outer shell (1) through the plurality of fasteners (4).

7. The axial skewed slot casing with back cavity for improving compressor performance as set forth in claim 6, wherein: the radial clearance between the annular rib (2) and the axial chute (3) is 3 mm-10 mm.

8. The axial skewed slot casing with back cavity for improving compressor performance as claimed in claim 1 or 7, wherein: the radial clearance between the annular rib (2) and the axial chute (3) is 5 mm-7 mm.

Technical Field

The invention relates to a casing. In particular to a dynamic oil-gas separation device, which belongs to the technical field of energy power.

Background

The existing gas turbine unit has the defects of low surge margin, poor stability expansion effect of a prototype anti-surge casing, large reduction of efficiency of a gas compressor under the design working condition and the low working condition, complex processing and no contribution to efficient and stable operation of the gas turbine unit. Although the conventional axial chute processing casing has a simple structure, the stability expansion effect is at a medium level, and when backflow fluid enters the blade channel again, the mixing loss is large when the backflow fluid is mixed with main flow fluid, so that the peak efficiency of the gas compressor is reduced more.

In conclusion, the conventional axial chute treatment casing has the problem that the peak efficiency of the compressor is greatly reduced.

Disclosure of Invention

The invention aims to solve the problem that the peak efficiency of a compressor is reduced more in the conventional axial chute processing casing. Further provides an axial line inclined groove type processing casing with a back cavity for improving the performance of the compressor.

The axial inclined groove type processing casing with the back cavity for improving the performance of the gas compressor comprises an outer casing, an annular rib and an axial inclined groove, wherein the annular rib is embedded into the outer casing, the axial inclined groove is installed in an inner hole of the annular rib and the outer casing, a plurality of slotted holes are formed in the axial inclined groove in an annular array mode, the slotted holes are respectively inclined in the axial direction and the radial direction, the axial inclination angle of the slotted hole is α -10-35 degrees, the radial inclination angle of the slotted hole is β -30-50 degrees, and a space enclosed between the outer casing and the axial inclined groove is a back cavity B.

Further, the shell body comprises a first annular section, a second annular section and a third annular section, wherein the first annular section, the second annular section and the third annular section are sequentially and coaxially arranged from left to right and are integrally manufactured.

Further, the inner apertures of the first annular section, the second annular section and the third annular section are sequentially reduced from left to right.

Furthermore, the axial chute is of an annular frustum structure, and the outer side walls of the air inlet section and the exhaust section of the axial chute are provided with limiting connecting bulges.

Furthermore, the inner diameter of the third annular section is gradually reduced from left to right, and the change of the inner diameter of the third annular section is in stable transition with the inner diameter of the annular frustum of the axial chute.

Furthermore, the limiting connecting lug of the axial inclined groove is detachably connected with the outer shell through a plurality of fasteners.

Further, the radial clearance between the annular rib and the axial inclined groove is 3-10 mm.

Preferably, the radial clearance between the annular rib and the axial chute is between 5mm and 7 mm.

Compared with the prior art, the invention has the following effects:

compared with the conventional axial chute processing casing, the back cavity rectifies the return fluid of the blade top boundary layer, reduces the impact loss of the return fluid and the main fluid when the return fluid reenters the blade channel, the air inlet section in the back cavity absorbs the over-thick end wall boundary layer at the downstream of the blade channel through static pressure difference, the end wall boundary layer fluid enters the exhaust section in the back cavity from the radial gap between the annular rib and the axial chute, the exhaust section in the back cavity improves the axial speed of the blade inlet through air injection, the air inlet attack angle is reduced, the separation of the blade back boundary layer is inhibited, and the stable operation range of the compressor is greatly expanded. The radial clearance between the annular rib and the axial chute arranged in the back cavity can control the flow of the backflow fluid, and the balance point of higher surge margin under the cruising working condition and lower peak efficiency loss under the design working condition is obtained by adjusting the radial clearance.

Drawings

FIG. 1 is a schematic diagram of an axial skewed slot type casing for a compressor with a back cavity according to the present invention.

Fig. 2 is a top view of an axial chute.

Fig. 3 is a cross-sectional view of fig. 2.

Detailed Description