US2026092607A1PendingUtilityA1
Gas suction pipe of centrifugal compressor
Assignee: JOHNSON CONTROLS AIR CONDITIONING AND REFRIGERATION WUXI CO LTDPriority: Sep 5, 2022Filed: Sep 1, 2023Published: Apr 2, 2026
Est. expirySep 5, 2042(~16.1 yrs left)· nominal 20-yr term from priority
F25B 1/053F04D 29/667F04D 29/441F04D 17/10F04D 29/4213
52
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0
Cited by
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0
Claims
Abstract
A gas suction pipe of a centrifugal compressor. A centrifugal compressor ( 120 ) is provided with a gas suction port ( 125 ), and the gas suction port ( 125 ) has a central axis; a gas suction pipe ( 150 ) introduces a fluid from an upstream component into the centrifugal compressor ( 120 ), and the fluid enters the gas suction pipe ( 150 ) in a direction substantially perpendicular to the central axis of the gas suction port ( 125 ). The gas suction pipe ( 150 ) comprises an imaginary middle cross-section, a downstream interface ( 226 ) connected to the centrifugal compressor ( 120 ), and an upstream interface ( 228 ) connected to the upstream component; the central axis of the gas suction port ( 125 ) of the centrifugal compressor ( 120 ) is located on the middle cross-section, and the gas suction pipe ( 150 ) has a shape of being symmetrical with respect to the middle cross-section; the inner contour of the downstream interface ( 226 ) is circular and the downstream interface ( 226 ) is connected to the gas suction port ( 125 ), and the inner contour of the upstream interface ( 228 ) comprises a first direction maximum spanning size D 1 located on the middle cross-section and a second direction maximum spanning size D 2 perpendicular to the middle cross-section, wherein D 1 is greater than D 2 .
Claims
exact text as granted — not AI-modified1 . A gas suction pipe of a centrifugal compressor, wherein the centrifugal compressor comprises a gas suction port, the gas suction port comprises a central axis, the gas suction pipe is configured to introduce a fluid from an upstream component into the centrifugal compressor and direct the fluid through the gas suction pipe in a direction substantially perpendicular to the central axis of the gas suction port, wherein the gas suction pipe comprises:
a middle cross-section, wherein the central axis of the gas suction port of the centrifugal compressor is located on the middle cross-section, and the gas suction pipe has a shape that is symmetrical with respect to the middle cross-section; a downstream interface connected to the centrifugal compressor, wherein an inner contour of the downstream interface is circular, and the downstream interface is connected to the gas suction port; and an upstream interface connected to the upstream component, wherein an inner contour of the upstream interface comprises a first direction maximum spanning size D 1 located on the middle cross-section, and comprises a second direction maximum spanning size D 2 perpendicular to the middle cross-section, wherein the first direction maximum spanning size D 1 is greater than the second direction maximum spanning size D 2 .
2 . The gas suction pipe of the centrifugal compressor of claim 1 , wherein:
the upstream component is cylindrical with an axis parallel to the central axis of the gas suction port, and the upstream component comprises a diameter D 0 , wherein the first direction maximum spanning size D 1 and the second direction maximum spanning size D 2 of the inner contour of the upstream interface satisfy: 0.55<D 1 /D 0 <0.7, D 2 <0.5×D 1 , and wherein a radius R 6 of the inner contour of the downstream interface satisfies:
0
.
4
3
<
R
6
max
/
D
1
<
0.57
.
3 . The gas suction pipe of the centrifugal compressor of claim 2 , wherein
the gas suction pipe has a centerline located on the middle cross-section, wherein the centerline is a spline, and the centerline satisfies:
Y
=
V
1
-
V
2
1
+
exp
(
X
-
V
3
V
4
)
+
V
2
,
wherein V 1 , V 2 , V 3 , V 4 satisfy:
-
7
e
7
<
V
1
<
-
6
e
7
,
1100
<
V
2
<
1
3
00
,
-
2950
<
V
3
<
-
2
750
,
250
<
V
4
<
270.
4 . The gas suction pipe of the centrifugal compressor of claim 3 , wherein the gas suction pipe comprises:
an inlet section, wherein the upstream interface is an end face of the inlet section, the inlet section comprises a connection part and a guide part, the connection part is configured to connect the gas suction pipe to the upstream component, a connection line of an inner contour of the guide part and an inner contour of the connection part intersects with the middle cross-section at an inner intersection point and an outer intersection point; an outlet section, wherein the downstream interface is an end face of the outlet section; a transition section, wherein the transition section connects the inlet section to the outlet section, wherein the gas suction pipe comprises a first cross-section, the first cross-section passes through the inner intersection point and the outer intersection point and is perpendicular to the middle cross-section, and wherein, between the first cross-section and the downstream interface, cross-sections of inner contours of the gas suction pipe at least on the inlet section and the transition section are elliptical with major axes located on the middle cross-section.
5 . The gas suction pipe of the centrifugal compressor of claim 4 , wherein:
between the first cross-section and the downstream interface, cross-sections of inner contours of the inlet section and the outlet section of the gas suction pipe gradually decrease in a direction toward the downstream interface.
6 . The gas suction pipe of the centrifugal compressor of claim 5 , wherein:
a cross-section of an inner contour of the transition section of the gas suction pipe first gradually increases and then gradually decreases in the direction toward the downstream interface.
7 . The gas suction pipe of the centrifugal compressor of claim 6 , wherein:
four cross-sections that divide a portion of the gas suction pipe located between the first cross-section and the downstream interface into five equal parts along the centerline are a second cross-section, a third cross-section, a fourth cross-section and a fifth cross-section, respectively, wherein the fourth cross-section is a largest cross-section of the transition section, wherein an included angle α 6 between the downstream interface and the first cross-section satisfies:
80
°
≤
α
6
≤
90
°
,
wherein a major axis radius R 1max and a minor axis radius R 1min of the first cross-section respectively satisfy:
R
1
max
=
0.5
×
D
1
,
0
.
9
<
R
1
min
/
R
1
max
<
0
.
9
5
,
wherein an included angle α 2 between the second cross-section and the first cross-section and a major axis radius R 2max and a minor axis radius R 2min of the second cross-section respectively satisfy:
0.1
<
α
2
/
α
6
<
0
.
1
5
,
0
.
6
8
<
R
2
max
/
D
1
<
0.78
,
0
.
9
2
<
R
2
min
/
R
2
max
<
0
.
9
8
,
wherein an included angle α 3 between the third cross-section and the first cross-section and a major axis radius R 3max and a minor axis radius R 3min of the third cross-section respectively satisfy:
0.25
<
α
3
/
α
6
<
0
.
3
8
,
0
.6
<
R
3
max
/
D
1
<
0.76
,
0
.8
<
R
3
min
/
R
3
max
<
0.9
,
wherein an included angle α 4 between the fourth cross-section and the first cross-section and a major axis radius R 4max and a minor axis radius R 4min of the fourth cross-section respectively satisfy:
0.45
<
α
4
/
α
6
<
0.6
,
0
.6
<
R
4
max
/
D
1
<
0.74
,
0.84
<
R
4
min
/
R
4
max
<
0.92
,
and wherein an included angle α 5 between the fifth cross-section and the first cross-section and a major axis radius R 5max and a minor axis radius R 5min of the fifth cross-section respectively satisfy:
0.7
<
α
5
/
α
6
<
0
.
8
,
0
.
4
5
<
R
5
max
/
D
1
<
0
.
6
,
0
.
9
8
<
R
5
min
/
R
5
max
<
1.05
.
8 . The gas suction pipe of the centrifugal compressor of claim 5 , wherein:
a cross-section of the transition section of the gas suction pipe gradually decreases in the direction toward the downstream interface.
9 . The gas suction pipe of the centrifugal compressor of claim 8 , wherein:
four cross-sections that divide a portion of the gas suction pipe located between the first cross-section and the downstream interface into five equal parts along the centerline are a second cross-section, a third cross-section, a fourth cross-section and a fifth cross-section, respectively, wherein the fourth cross-section is a largest cross-section of the transition section, wherein an included angle α 16 between the downstream interface and the first cross-section satisfies:
80
°
≤
α
16
≤
90
°
,
wherein a major axis radius R 11min and a minor axis radius R 12min of the first cross-section respectively satisfy:
R
11
max
=
0.5
×
D
1
1
,
0
.9
<
R
11
min
/
R
11
max
<
0.95
,
wherein an included angle α 12 between the second cross-section and the first cross-section and a major axis radius R 12max and a minor axis radius R 12min of the second cross-section respectively satisfy:
0.1
<
α
1
2
/
α
1
6
<
0
.
1
5
,
0
.
6
8
<
R
12
max
/
D
11
<
0
.
7
8
,
0
.
9
2
<
R
12
min
/
R
12
max
<
0
.
9
8
,
wherein an included angle α 13 between the third cross-section and the first cross-section and a major axis radius R 13max and a minor axis radius R 13min of the third cross-section respectively satisfy:
0.25
<
α
13
/
α
13
<
0.38
,
0
.
5
5
<
R
13
max
/
D
11
<
0
.
7
,
0
.8
<
R
13
min
/
R
13
max
<
0
.
9
,
wherein an included angle α 14 between the fourth cross-section and the first cross-section and a major axis radius R 14max and a minor axis radius R 14min of the fourth cross-section respectively satisfy:
0.45
<
α
1
4
/
α
1
6
<
0
.
6
,
0
.5
<
R
14
max
/
D
11
<
0
.
6
,
0
.9
<
R
14
min
/
R
14
max
<
0
.
9
5
,
and wherein an included angle α 15 between the fifth cross-section and the first cross-section and a major axis radius R 15max and a minor axis radius R 15min of the fifth cross-section respectively satisfy:
0.7
<
α
1
5
/
α
1
6
<
0
.
8
,
0
.
4
5
<
R
15
max
/
D
11
<
0
.
6
,
0
.
9
8
<
R
15
min
/
R
15
max
<
1.05
.
10 . A centrifugal compressor, wherein the centrifugal compressor comprises the gas suction pipe of claim 1 .Join the waitlist — get patent alerts
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