CN103883835A - Pipeline damping device - Google Patents
Pipeline damping device Download PDFInfo
- Publication number
- CN103883835A CN103883835A CN201410155224.XA CN201410155224A CN103883835A CN 103883835 A CN103883835 A CN 103883835A CN 201410155224 A CN201410155224 A CN 201410155224A CN 103883835 A CN103883835 A CN 103883835A
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- CN
- China
- Prior art keywords
- lift angle
- stream guidance
- spiral stream
- angle spiral
- guidance pipe
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/041—Devices damping pulsations or vibrations in fluids specially adapted for preventing vibrations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a pipeline damping device. Mediums are guided to flow spirally through a spiral flow guide channel in the pipeline damping device. Because centrifugal force is generated when the mediums rotate, the mediums have balancing and stabilizing effect on a pipeline, and thus the damping purpose is achieved. Meanwhile, when mediums flow, because pressure difference between the edge of the flow channel and the center of the flow channel is generated under the action of rotation, bubbles generated by pressure drop are extruded to the center of the flow channel and keep away from the wall face of the device in the flowing process, as pressure rises gradually, the center of the flow channel in the rear of the pipeline damping device collapses, and thus the purpose of eliminating cavitation is achieved. Rotary rib positioning disks 3 are installed at the two ends in a pipeline 2, a variable-lift-angle spiral flow guide pipe 4 and a double-side variable-lift-angle spiral flow guide pipe 5 are fixed into the pipeline 2 between the rotary rib positioning disks 3, the outer wall face of the variable-lift-angle spiral flow guide pipe 4 is attached to the inner wall face of the pipeline 2, and the double-side variable-lift-angle spiral flow guide pipe 5 is installed in the variable-lift-angle spiral flow guide pipe 4.
Description
Technical field
The present invention relates to valve pipe fitting, specifically for the device of pipe vibration-damping.
Background technique
In prior art, because pipe interior rate of flow of fluid increases the pulsation that causes turbulent flow to cause, can cause the vibration of pipeline and associated components, when serious, can make link position and parts be damaged, therefore except controlling run parameter is avoided the pulsation of pipe stream, also adopt pipe shock absorptor and hydraulic type damper, its principle is all to adopt damping vibration attenuation, when strengthening equipment investment, also make mobile energy decay thereupon, energy consumption is increased.In addition, in transmitting liquid saturated media, because pressure drop in flow process can cause cavitation erosion, existing method mainly adopts many and step-down, reduce pressure reduction to reach the object that weakens cavitation phenomenon, but need to increase corresponding device, and complex structure, degradation of energy is serious, and energy consumption is increased.
Summary of the invention
The object of the invention is to for existing technological deficiency, thereby design a kind of pipe vibration damper, its spiral stream guidance groove boot media by pipe vibration damper inside is spinned mobile, because medium rotation produces centrifugal force, pipeline is played to balance and stability effect, thereby reach the object of vibration damping.Simultaneously, medium is in mobile process, because turning effort produces the pressure difference at runner edge and runner center, make the bubble producing due to pressure decreased in flow process be extruded into runner center, away from equipment wall surface, along with pressure gos up gradually, crumble and fall at the runner center of pipe vibration damper mid-rear portion, reach the object of eliminating cavitation erosion.The present invention is simple in structure, is convenient to maintenance and operation, can reduce degradation of energy effect, saves the energy that transports flowing.Effectively overcome the problem described in background technique.
The present invention is a kind of pipe vibration damper, include flange 1 and pipeline 2, the two ends, inside of described pipeline 2 are provided with revolves muscle positioning disk 3, change lift angle spiral stream guidance pipe 4 and bilateral become lift angle spiral stream guidance pipe 5 and are fixed in the pipeline 2 revolving between muscle positioning disk 3, become the outer wall of lift angle spiral stream guidance pipe 4 and the internal face laminating of pipeline 2, bilateral becomes lift angle spiral stream guidance pipe 5 and is arranged on the inside that becomes lift angle spiral stream guidance pipe 4; From entering flow path direction, become lift angle spiral stream guidance pipe 4 identical with the spiral chute rotation direction of opening on bilateral change lift angle spiral stream guidance pipe 5, and be clockwise direction rotation.
The present invention is compared with background technique, and the useful effect having is: described pipe vibration damper, medium is along runner medial axis XX ' bottom horizontal flow sheet from left to right.Medium enters from pipe vibration damper passage left side, and flow out on right side.In pipe vibration damper, flowing medium is become lift angle spiral stream guidance pipe 4 and bilateral and becomes lift angle spiral stream guidance pipe 5 to be divided into two plumes moving, is becoming between lift angle spiral stream guidance pipe 4 inwalls and bilateral change lift angle spiral stream guidance pipe 5 outer wall runners, at the first entrance I
1with the first exit point O
1water conservancy diversion region, forms outside eddy flow; Become lift angle spiral stream guidance pipe 5 inwall sides at bilateral; At the second entrance I
2with the second exit point O
2water conservancy diversion region, surveys eddy flow in forming, and the rotation direction of both sides eddy flow is identical.Become on lift angle spiral stream guidance pipe 4 inwalls and bilateral change lift angle spiral stream guidance pipe 5 outer walls and inwall and all have and become lift angle spiral chute.Along runner medial axis XX ', from the first entrance I
1with the second entrance I
2place is to the first exit point O
1with the second exit point O
2, spiral chute lift angle reduces gradually, until the first exit point O
1with the second exit point O
2place's stream guidance spiral groove lift angle reduces to minimum, and medium eddy flow effect reaches the strongest.In the process forming in medium helical flow, make medium form abundant eddy flow by stream guidance spiral groove, make medium stream medial axis XX ' rotation aggravation gradually, reach maximum in pipe vibration damper exit position rotational speed, thereby formation centrifugal force, reduces pipe vibration damper and downstream line due to the pulsation-induced vibration of pipe stream.Due to the effect of centrifugal force, the relatively large liquid of density moves along circumferentially pasting flow path wall surface current, and the relatively little bubble of density is compressed in runner central position flow further downstream and crumbles and fall, and bubble, away from solid wall surface, has reached the effect of eliminating cavitation erosion.In order fully to form eddy flow, spiral stream guidance channels designs is longer, and actual internal area and total stream throughput direction do not change, and has obviously reduced the runner drag losses causing that suddenly change, has played the object of attenuating energy consumption.The present invention is simple in structure, is convenient to install and maintenance, and input cost is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention, Fig. 2 be in the present invention, revolve muscle positioning disk 3 A to structural representation, Fig. 3 be in the present invention bilateral become lift angle spiral stream guidance pipe 5 at A the structural representation to end face.
Embodiment
As shown in Figure 1, described pipe vibration damper, include flange 1 and pipeline 2, its feature also includes: the described inner two ends of pipeline 2 are provided with revolves muscle positioning disk 3, change lift angle spiral stream guidance pipe 4 and bilateral become lift angle spiral stream guidance pipe 5 and are fixed in the pipeline 2 revolving between muscle positioning disk 3, become lift angle angle spiral stream guidance pipe 4 outer wall and pipeline 2 internal face laminatings, bilateral becomes lift angle spiral stream guidance pipe 5 and is arranged on change spiral stream guidance pipe 4 inside, lift angle angle.From entering flow path direction, in Fig. 1, A, to observation, becomes lift angle angle spiral stream guidance pipe 4 identical with the spiral chute rotation direction of opening on bilateral change lift angle spiral stream guidance pipe 5, is clockwise direction rotation.
As shown in Figure 1, medium flows from left to right along runner medial axis XX ', and flowing medium is become lift angle spiral stream guidance pipe 4 and bilateral and becomes lift angle spiral stream guidance pipe 5 to be divided into two plumes moving; Becoming between the outer wall runner of lift angle angle spiral stream guidance pipe 4 inwalls and bilateral change lift angle spiral stream guidance pipe 5, at the first entrance I
1with the first exit point O
1water conservancy diversion region, form outside eddy flow; Become the inwall side of lift angle angle spiral stream guidance pipe 5 at bilateral; At the second entrance I
2with the second exit point O
2water conservancy diversion region, surveys eddy flow in forming, and the rotation direction of both sides eddy flow is identical.
The change lift angle spiral stream guidance groove of P for opening in bilateral change lift angle spiral stream guidance pipe 5 runner inner wall in Fig. 1, the change lift angle spiral stream guidance groove of N for opening on bilateral change lift angle spiral stream guidance pipe 5 runner outer walls, M is for becoming the change lift angle spiral stream guidance groove of opening in lift angle spiral stream guidance pipe 4 runner inner wall, and in Fig. 1, direction shown in arrow is media flow direction.
As shown in Figure 1 and Figure 2, become lift angle spiral stream guidance pipe 4 and be arranged in pipeline 2, the internal diameter of pipeline 2 is D; Spiral chute lift angle is at the first entrance I
175 ° ~ 80 ° of place's values, at the first exit point O
1place's value is 45 ° ~ 50 °, the first entrance I
1with the first exit point O
1lift angle to differ be 30 °, along with flow direction spiral chute lift angle reduces gradually; The flow channel length that becomes lift angle spiral stream guidance pipe 4 is L
4, its span is 6D ~ 7D, and the largest tube wall thickness that becomes lift angle spiral stream guidance pipe 4 runners is δ, and minimum diameter is d; Become internal face circumferential uniform 8 change lift angle spiral chutes centered by the XX` of runner medial axis of lift angle spiral stream guidance pipe 4, become the groove width K of lift angle spiral stream guidance pipe 4
m=3 δ ~ 4 δ, groove depth H
m=0.4 δ ~ 0.6 δ.
As shown in Figure 1, Figure 2, Figure 3 shows, bilateral becomes lift angle spiral stream guidance pipe 5 and is fixedly mounted in change lift angle spiral stream guidance pipe 4 by revolving muscle positioning disk 3, and the external diameter that bilateral becomes lift angle spiral stream guidance pipe 5 is d
1, at the second entrance I
2the internal diameter of entry end be d
2, the wall thickness δ=d of entry end
1-d
2, the second exit point O
2the internal diameter size of the outlet end at place is d
2-L
4* tan (1 ° ~ 2 °); Spiral chute lift angle is at the second entrance I
2the span at place is 75 ° ~ 80 °, at the second exit point O
2the span at place is 45 ° ~ 50 °, the second entrance I
2with the second exit point O
2lift angle differ 30 °, along with flow direction spiral chute lift angle reduces gradually; The flow channel length that bilateral becomes lift angle spiral stream guidance pipe 5 is all L with change lift angle spiral stream guidance pipe 4
4, its span is 6D ~ 7D; Bilateral becomes inside and outside wall both sides circumferential each uniform 6 change lift angle spiral chutes centered by the XX` of runner medial axis of lift angle spiral stream guidance pipe 5, and bilateral becomes the outer wall groove width K of lift angle spiral stream guidance pipe 5
n=3 δ ~ 4 δ, groove depth H
n=0.3 δ ~ 0.4 δ; Inwall groove width K
p=2 δ ~ 3 δ, groove depth H
p=0.3 δ ~ 0.4 δ.
As shown in Figure 1 and Figure 2, the described muscle positioning disk 3 that revolves is made up of inside and outside ring; Two interannulars are used with interior ring tangent, and angle is 6 straight muscle connection supports of 60 ° each other, and 6 straight muscle are counterclockwise around the rotation direction of interior ring; Interior ring and bilateral become lift angle spiral stream guidance pipe 5 and are welded and fixed, and outer shroud is welded and fixed with change lift angle spiral stream guidance pipe 4; Revolve the thickness H of the outer shroud of muscle positioning disk 3
3=δ-0.5H
m, the external diameter H of interior ring
1=d
1-0.5H
n, the internal diameter H of interior ring
2=d
2+ 0.5H
p; Straight muscle width is 0.3 H
3; The equal rounding of each straight muscle link position.
As shown in Figure 1, become lift angle spiral stream guidance pipe 4 identical with the rotation direction that bilateral becomes lift angle spiral stream guidance pipe 5, contrary with the rotation direction of revolving muscle positioning disk 3.
As shown in Figure 2, the described muscle positioning disk 3 that revolves is made up of inside and outside ring.Two interannulars are used with interior ring tangent, and angle is 6 straight muscle connection supports of 60 ° each other, and 6 straight muscle are counterclockwise around the rotation direction of interior ring.Interior ring and bilateral become lift angle spiral stream guidance pipe 5 and are welded and fixed, and outer shroud is welded and fixed with change lift angle angle spiral stream guidance pipe 4.
As shown in Figure 3, described bilateral becomes lift angle spiral stream guidance pipe 5, and internal and external screw groove present position angle is identical, guarantees that wall thickness change is less.
As shown in Figure 1, described pipe vibration damper, medium flows from left to right along runner medial axis XX ', flowing medium is become lift angle spiral stream guidance pipe 4 and bilateral and becomes lift angle spiral stream guidance pipe 5 to be divided into two plumes moving, becoming between lift angle spiral stream guidance pipe 4 inwalls and bilateral change lift angle spiral stream guidance pipe 5 outer wall runners, at the first entrance I
1with the first exit point O
1point water conservancy diversion region, forms outside eddy flow; Become lift angle spiral stream guidance pipe 5 inwall sides at bilateral; At the second entrance I
2with the second exit point O
2water conservancy diversion region, surveys eddy flow in forming, and the rotation direction of both sides eddy flow is identical.
As shown in Figure 1, described change lift angle spiral stream guidance pipe 4 is arranged in pipeline 2, and the internal diameter of pipeline 2 is D.Spiral chute lift angle is at the first entrance I
175 ° ~ 80 ° of place's values, at the first exit point O
1place's value is 45 ° ~ 50 °, and 2 lift angles differ 30 °, along with flow direction spiral chute lift angle reduces gradually.The flow channel length that becomes lift angle spiral stream guidance pipe 4 is L
4, its span is 6D ~ 7D, and the largest tube wall thickness that becomes lift angle spiral stream guidance pipe 4 runners is δ, and minimum diameter is d.Become lift angle spiral stream guidance pipe 4 internal faces circumferential uniform 8 change lift angle spiral chutes centered by the XX` of runner medial axis, Fig. 1 is the sectional view that forms plane by runner medial axis XX`, the wherein groove width K of shown change lift angle spiral stream guidance pipe 4
m=3 ~ 4 δ, groove depth H
m=0.4 ~ 0.6 δ.The Main Function that becomes lift angle spiral stream guidance pipe 4 is drainage, fully forms eddy flow.
As shown in Figure 3, internal and external screw groove present position angle staggers, and inner side spiral chute width is less than the distance between the spiral chute of outside, guarantees that wall thickness change is less.The Main Function that bilateral becomes lift angle spiral stream guidance pipe 5 is bilateral drainage, strengthens inner side swirl velocity, is convenient to outlet port two plumes and converges abundant formation eddy flow.
The described muscle positioning disk 3 that revolves, as shown in Figure 2, the described muscle positioning disk 3 that revolves is made up of inside and outside ring.Two interannulars are used with interior ring tangent, and angle is 6 straight muscle connection supports of 60 ° each other, and 6 straight muscle are counterclockwise around the rotation direction of interior ring.Interior ring and bilateral become lift angle spiral stream guidance pipe 5 and are welded and fixed, and outer shroud is welded and fixed with change lift angle angle spiral stream guidance pipe 4.Revolve the thickness H of muscle positioning disk 3 outer shrouds
3=δ-0.5H
m, the external diameter H of interior ring
1=d
1-0.5H
n, the internal diameter H of interior ring
2=d
2+ 0.5H
p.Straight muscle width is 0.3 H
3.The rotation direction of revolving muscle positioning disk 3 with become lift angle spiral stream guidance pipe 4, that bilateral becomes lift angle spiral stream guidance pipe 5 rotation directions is contrary, object is to become lift angle spiral stream guidance pipe 5 in water conservancy diversion process owing to becoming lift angle spiral stream guidance pipe 4 and bilateral, be subject to fluid force to cause opposing torque, this design is stressed in order to make to revolve the straight muscle of muscle positioning disk 3, stressed good to guarantee.The equal rounding of each straight muscle link position.
Claims (6)
1. a pipe vibration damper, include flange (1) and pipeline (2), it is characterized in that: the two ends, inside of described pipeline (2) are provided with revolves muscle positioning disk (3), change lift angle spiral stream guidance pipe (4) and bilateral become lift angle spiral stream guidance pipe (5) and are fixed in the pipeline (2) revolving between muscle positioning disk (3), become the outer wall of lift angle spiral stream guidance pipe (4) and the laminating of the internal face of pipeline (2), bilateral becomes lift angle spiral stream guidance pipe (5) and is arranged on the inside that becomes lift angle spiral stream guidance pipe (4); From entering flow path direction, become lift angle spiral stream guidance pipe (4) identical with the spiral chute rotation direction of opening on bilateral change lift angle spiral stream guidance pipe (5), and be clockwise direction rotation.
2. pipe vibration damper according to claim 1, is characterized in that: along runner medial axis, (XX's medium from left to right ') flows, and flowing medium is become lift angle spiral stream guidance pipe (4) and bilateral and becomes lift angle spiral stream guidance pipe (5) to be divided into two plumes moving; Becoming between the outer wall runner of lift angle spiral stream guidance pipe (4) inwall and bilateral change lift angle spiral stream guidance pipe (5), at the first entrance (I
1) and the first exit point (O
1) water conservancy diversion region, form outside eddy flow; Become the inwall side of lift angle spiral stream guidance pipe (5) at bilateral; At the second entrance (I
2) and the second exit point (O
2) water conservancy diversion region, in forming, survey eddy flow, the rotation direction of both sides eddy flow is identical.
3. pipe vibration damper according to claim 1 and 2, is characterized in that becoming lift angle spiral stream guidance pipe (4) and is arranged in pipeline (2), and the internal diameter of pipeline (2) is D; Spiral chute lift angle is at the first entrance (I
1) locate 75 ° ~ 80 ° of values, at the first exit point (O
1) to locate value be 45 ° ~ 50 °, the first entrance (I
1) and the first exit point (O
1) lift angle to differ be 30 °, along with flow direction spiral chute lift angle reduces gradually; The flow channel length that becomes lift angle spiral stream guidance pipe (4) is L
4, its span is 6D ~ 7D, and the largest tube wall thickness that becomes lift angle spiral stream guidance pipe (4) runner is δ, and minimum diameter is d; Become internal face circumferential uniform 8 change lift angle spiral chutes centered by runner medial axis (XX`) of lift angle spiral stream guidance pipe (4), become the groove width (K of lift angle spiral stream guidance pipe (4)
m)=3 δ ~ 4 δ, groove depth (H
m)=0.4 δ ~ 0.6 δ.
4. pipe vibration damper according to claim 1 and 2, is characterized in that bilateral becomes lift angle spiral stream guidance pipe (5) and is fixedly mounted in change lift angle spiral stream guidance pipe (4) by revolving muscle positioning disk (3), and the external diameter that bilateral becomes lift angle spiral stream guidance pipe (5) is d
1, at the second entrance (I
2) the internal diameter of entry end be d
2, the wall thickness δ=d of entry end
1-d
2, the second exit point (O
2) internal diameter size of the outlet end located is d
2-L
4* tan (1 ° ~ 2 °); Spiral chute lift angle is at the second entrance (I
2) span located is 75 ° ~ 80 °, at the second exit point (O
2) span located is 45 ° ~ 50 °, the second entrance (I
2) and the second exit point (O
2) lift angle differ 30 °, along with flow direction spiral chute lift angle reduces gradually; The flow channel length that bilateral becomes lift angle spiral stream guidance pipe (5) is all L with change lift angle spiral stream guidance pipe (4)
4, its span is 6D ~ 7D; Bilateral becomes inside and outside wall both sides circumferential each uniform 6 change lift angle spiral chutes centered by runner medial axis (XX`) of lift angle spiral stream guidance pipe (5), and bilateral becomes the outer wall groove width (K of lift angle spiral stream guidance pipe (5)
n)=3 δ ~ 4 δ, groove depth (H
n)=0.3 δ ~ 0.4 δ; Inwall groove width (K
p)=2 δ ~ 3 δ, groove depth (H
p)=0.3 δ ~ 0.4 δ; Internal and external screw groove present position angle staggers, and inner side spiral chute width is less than the distance between the spiral chute of outside.
5. according to the pipe vibration damper described in claim 1 or 4, it is characterized in that: the described muscle positioning disk (3) that revolves is made up of inside and outside ring; Two interannulars are used with interior ring tangent, and angle is 6 straight muscle connection supports of 60 ° each other, and 6 straight muscle are counterclockwise around the rotation direction of interior ring; Interior ring and bilateral become lift angle spiral stream guidance pipe (5) and are welded and fixed, and outer shroud is welded and fixed with change lift angle spiral stream guidance pipe (4); Revolve the thickness (H of the outer shroud of muscle positioning disk (3)
3)=δ-0.5H
m, the external diameter (H of interior ring
1)=d
1-0.5H
n, the internal diameter (H of interior ring
2)=d
2+ 0.5H
p; Straight muscle width is 0.3 H
3; The equal rounding of each straight muscle link position.
6. according to the pipe vibration damper described in claim 1 or 5, it is characterized in that becoming lift angle spiral stream guidance pipe (4) identical with the rotation direction that bilateral becomes lift angle spiral stream guidance pipe (5), contrary with the rotation direction of revolving muscle positioning disk (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410155224.XA CN103883835B (en) | 2014-04-18 | 2014-04-18 | A kind of pipe vibration damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410155224.XA CN103883835B (en) | 2014-04-18 | 2014-04-18 | A kind of pipe vibration damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103883835A true CN103883835A (en) | 2014-06-25 |
| CN103883835B CN103883835B (en) | 2016-02-17 |
Family
ID=50952881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410155224.XA Expired - Fee Related CN103883835B (en) | 2014-04-18 | 2014-04-18 | A kind of pipe vibration damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103883835B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340501A (en) * | 2018-12-10 | 2019-02-15 | 哈尔滨工程大学 | A kind of steam condensation induction water hammer cancellation element based on fixed twisted strip |
| CN111969793A (en) * | 2020-09-10 | 2020-11-20 | 张家港市恒强冷却设备有限公司 | Marine double-barrelled cooler |
| CN116672916A (en) * | 2023-07-28 | 2023-09-01 | 北京凯莱谱生物科技有限公司 | Chromatograph with mixed wave reduction device and detection method thereof |
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2014
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340501A (en) * | 2018-12-10 | 2019-02-15 | 哈尔滨工程大学 | A kind of steam condensation induction water hammer cancellation element based on fixed twisted strip |
| CN111969793A (en) * | 2020-09-10 | 2020-11-20 | 张家港市恒强冷却设备有限公司 | Marine double-barrelled cooler |
| CN116672916A (en) * | 2023-07-28 | 2023-09-01 | 北京凯莱谱生物科技有限公司 | Chromatograph with mixed wave reduction device and detection method thereof |
| CN116672916B (en) * | 2023-07-28 | 2023-11-17 | 北京凯莱谱生物科技有限公司 | Chromatograph with mixed wave reduction device and detection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103883835B (en) | 2016-02-17 |
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