CN107882712B - But quick switch outer cannula formula Rong Guanrong pulsation attenuator - Google Patents
But quick switch outer cannula formula Rong Guanrong pulsation attenuator Download PDFInfo
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- CN107882712B CN107882712B CN201710795675.3A CN201710795675A CN107882712B CN 107882712 B CN107882712 B CN 107882712B CN 201710795675 A CN201710795675 A CN 201710795675A CN 107882712 B CN107882712 B CN 107882712B
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- 230000010349 pulsation Effects 0.000 title claims abstract description 102
- 238000003860 storage Methods 0.000 claims abstract description 18
- 238000013016 damping Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 41
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
- F04B39/0066—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using sidebranch resonators, e.g. Helmholtz resonators
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a rapid-switching external cannula type Rong Guanrong pulsation attenuator which comprises a buffer tank and an external cannula, wherein a switching valve is arranged at the middle part of the buffer tank, the interior of the buffer tank is divided into a left cavity and a right cavity by the switching valve, the two cavities are communicated by two ends of the external cannula, wherein an air inlet is arranged at the bottom of one cavity at one side, and an air outlet is arranged at the bottom of the other cavity at the other side. The invention has two application modes, one is an air storage tank mode, and a switching valve is opened in the mode to control air flow pulsation as a common air storage tank; the other is a capacity Guan Rong mode, and the switching valve is closed in the mode to form the outer cannula type Rong Guanrong pulsation attenuator, and gas flows through one side cavity, the outer cannula and the other side cavity, so that the attenuation effect of the attenuator on airflow pulsation is improved. The two modes can realize quick switching, and the engineering application is flexible. The outer cannula is arranged into an S shape, the structure is compact, and the outer cannula is fixed on the outer side of the buffer tank through the outer cannula supporting part, so that the vibration of the outer cannula can be reduced, and the service life of the outer cannula is prolonged.
Description
Technical Field
The invention relates to the technical field of air flow pulsation attenuation of compressors and pipeline systems, in particular to an externally-inserted pipe type Rong Guanrong pulsation attenuator capable of being rapidly switched.
Background
The periodic suction and exhaust of the compressor can cause air flow pulsation in the pipeline, and the air flow pulsation is one of main reasons for causing pipeline vibration and pipeline stress damage, so that the research and control of the air flow pulsation are important links for improving the safety and reliability of the compressor. The conventional device for controlling the air flow pulsation comprises a buffer tank, wherein the buffer tank is a conventional air flow pulsation control device which is equivalent to a gas spring and can reduce pressure pulsation after the buffer tank. While the buffer tank can effectively attenuate the flow pulsations of the downstream piping, it has several pass frequencies where the amount of pulsation attenuation is zero, i.e., the components of the flow pulsations at these frequencies can pass completely without any attenuation and propagate toward the downstream piping.
In engineering applications, in order to further improve the attenuation effect of the buffer tank, a pulsation attenuator is often adopted, wherein a volume Guan Rong type pulsation attenuator mainly characterized by a plurality of expansion series is most typical. However, the existing inner-tube type pulsation attenuator is inconvenient to process and install, difficult to adjust in use, an inner part and a tank body are connected through a welding part, additional stress is generated by vibration of the inner part to drive the tank body to vibrate, the strength of the tank body is unfavorable, pulsation coupling is easy to occur to influence the attenuation effect, and the length of the inner-tube is limited by the volume of a buffer tank, so that the buffer tank is overlarge in volume or poor in pulsation attenuation effect in field application.
Disclosure of Invention
Aiming at the structural defect of the existing inner cannula type pulsation attenuator, the invention provides an outer cannula type Rong Guanrong type pulsation attenuator which can be rapidly switched for two purposes, has compact structure, flexible installation, no limitation of the cannula size by the volume of a buffer tank and excellent airflow pulsation attenuation performance, and the pulsation attenuator can be widely applied to compressors and pipeline systems, so that the airflow pulsation in the pipeline is sufficiently reduced, the safe and stable operation of the compressor system is ensured, and the economic benefit is increased.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme: the utility model provides a but quick switch outer intubate type Rong Guanrong type pulsation attenuator, its includes buffer tank and outer intubate, wherein, is equipped with the diverter valve in buffer tank middle part, and the diverter valve is with buffer tank internal portion two cavities, and outer intubate's both ends communicate with two cavities respectively, wherein, are equipped with the air inlet in the cavity bottom of one side, are equipped with the gas vent in the cavity bottom of opposite side, and outer intubate passes through outer intubate supporting part to be fixed in the outside of buffer tank. The outer cannula is fixed on the outer side of the buffer tank through an outer cannula supporting part.
The switching valve adopts the design of a butt clamp type butterfly valve, a butterfly plate of the butterfly valve is arranged in the diameter direction of a pipeline, and the valve is connected between flanges of two chambers of the air storage tank through a stud. The switching valve has a rapid switching function, and the opening and closing states of the switching valve correspond to the air storage tank mode and the capacity Guan Rong mode of the pulsation attenuator. When in the air storage tank mode, the switching valve is opened to serve as a common air storage tank to control air flow pulsation; and when in Rong Guanrong mode, the switching valve is closed to form the outer cannula type Rong Guanrong pulsation attenuator, and air flows through the one side cavity, the outer cannula and the other side cavity, so that the attenuation effect of the attenuator on air flow pulsation is improved.
The attenuator adopts the outer tube form to connect in the gas holder outside, compares in traditional interpolation formula Rong Guanrong pulsation attenuator, and outer tube length is not restricted by buffer tank volume, guarantees the required sufficient length of pulsation attenuation effect. And the outer insertion tube is arranged in an S shape, so that the structure is compact.
The outer cannula is connected to the buffer tank through the outer cannula supporting part, so that vibration of the outer cannula is reduced, and the service life of the outer cannula is prolonged. The supporting part comprises a supporting platform and a buffer tank clamp, wherein the outer plug pipe is installed on the supporting platform through the outer plug pipe clamp. The buffer tank clamp holds the buffer tank, and the supporting platform is welded with the buffer tank clamp through the clamp boss. And reinforcing ribs are arranged between the supporting platform and the buffer tank clamp.
Preferably, the butterfly valve for the switching valve is in a fully opened state initially, the butterfly valve is elastically sealed, and the sealing ring is embedded on the valve body.
Preferably, the outer tube support member is provided along the length direction of the surge tank and is symmetrically arranged with respect to the switching valve.
Preferably, the buffer tank clamp is connected with the buffer tank through a bolt, and a rib plate is arranged at the bolt.
Preferably, a spacer is provided between the two joints of the outer cannula clamp.
Aiming at the problems that the existing pulsation attenuator technology is difficult to process, install and implement, difficult to adjust in use and unsatisfactory in attenuation effect, the invention designs the rapid-switching external cannula type Rong Guanrong pulsation attenuator with excellent performance and convenient installation, and the invention has the following advantages: the air storage tank has an air storage tank mode capable of being switched rapidly and a capacity Guan Rongmo, and engineering application is flexible; compared with the prior interpolation type pulsation attenuator, the buffer tank of the external interpolation type Rong Guanrong type pulsation attenuator can be rapidly switched to achieve the same pulsation attenuation effect, and has smaller volume and compact structure; the design of the external inserted pipe type pipeline is beneficial to the improvement and optimization of the existing buffer tank, and the attenuation effect of the attenuator on airflow pulsation can be further improved by lengthening the external pipeline of the capacity Guan Rong type pulsation attenuator; the outer cannula is fixed in an outer cannula supporting mode, so that the outer cannula and the buffer tank are integrated, outer cannula vibration is reduced, the service life of the outer cannula is prolonged, the connection strength of the clamp and the supporting platform is enhanced through the reinforcing ribs, and the load distribution of the supporting platform is more uniform and stable.
Drawings
Fig. 1 is a schematic structural view of a pulsation damper according to the present invention;
FIG. 2 is a front view of FIG. 1;
fig. 3 is a sectional view of B-B of fig. 2.
Fig. 4 is a graph showing the attenuation effect with the pulsation frequency in the air storage tank mode and the capacity mode.
Fig. 5 is a graph comparing buffer tank and capacity Guan Rongmo type damping effect simulation results.
Fig. 6 is a graph showing the effect of structural parameters on the pulsation attenuation effect in the capacitance mode of the vessel.
The reference numerals in the drawings are as follows: 1. a buffer tank; 2. an outer cannula; 3. a switching valve; 4,5, a buffer tank clamp; 6,7, clamping hoop bosses; 8,9, supporting the platform; 10. an outer tube clamp; 11. a left chamber; 12. a right chamber; 13. an air inlet; 14, an exhaust port; 15. reinforcing ribs; 16. rib plates; 17. and (3) a plate.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
As shown in fig. 1 and 2, the present embodiment relates to a pulsation damper comprising a surge tank 1 and an outer tube 2, wherein a switching valve 3 is provided in the middle of the surge tank 1, the switching valve 3 divides the interior of the surge tank 1 into left and right two chambers 11,12, and both ends of the outer tube 2 are respectively communicated with the two chambers 11,12, wherein an air inlet 13 is provided at the bottom of one chamber 11, and an air outlet 14 is provided at the bottom of the other chamber 12. The switching valve 3 is designed by adopting a butt-clamping butterfly valve with simple structure, small volume and light weight, a butterfly plate 17 of the butterfly valve is arranged in the diameter direction of a pipeline, and the valve is connected between flanges of two chambers 11 and 12 of the air storage tank through a stud. The butterfly valve adopts elastic seal, and the sealing washer is inlayed on the valve body. The switching valve 3 has a rapid switching function, the opening and closing states of the switching valve correspond to the air storage tank mode and the capacity Guan Rongmo of the pulsation attenuator, and the two modes can realize rapid switching and are flexible in engineering application. When in the air storage tank mode, the switching valve is opened to serve as a common air storage tank to control air flow pulsation; in Rong Guanrong mode, the switching valve is closed, and the gas flows through the one side chamber, the outer cannula and the other side chamber to form the outer cannula type Rong Guanrong pulsation attenuator.
The outer tube 2 is fixed to the outside of the buffer tank 1 by outer tube support members, and preferably, two sets of outer tube support members are employed in the present embodiment, the outer tube support members being disposed at different positions of the buffer tank 1 in the longitudinal direction of the buffer tank 1 and symmetrically arranged with respect to the switching valve 3. Wherein the outer tube 2 is arranged in an S-shape, mainly considering that the length of the outer tube is one of the important factors affecting the pulsation damping effect, the longer the length of the outer tube 2, the lower the damping pulsation frequency, the better the airflow pulsation damping effect, and therefore, in order to achieve the desired pulsation damping effect, the S-shaped outer tube 2 is compactly arranged in the present embodiment so that the length of the outer tube 2 is sufficiently long.
As shown in fig. 3, the outer tube support member includes support platforms 8,9 and buffer tank clamps 4,5, wherein the outer tube 2 is mounted on the support platforms 8,9 through outer tube clamps 10, and a gasket is provided between two joints of each outer tube clamp 10, so that the outer tube 2 and the buffer tank 4 are integrated, thereby reducing vibration of the outer tube 2 and improving service life of the outer tube 2.
The buffer tank clamps 4 and 5 are connected with the buffer tank 1 through bolts and other parts, rib plates 16 are arranged at the bolts to prevent the clamps from being distorted and deformed caused by uneven stress at the bolts, and the support platforms 8 and 9 are tightly connected with the buffer tank clamps 4 and 5 through clamp bosses 6 and 7. Specifically, one end of the clamp boss 6,7 is connected with the buffer tank clamp 4,5 by welding, and the other end of the clamp boss 6,7 is connected with the support platform 8,9 by welding, so that the height of the support platform 8,9 is ensured by the height of the clamp boss 6,7, thereby facilitating the connection of the outer insertion tube 2 to the support platform 8,9.
In addition, still be equipped with strengthening rib 15 between supporting platform 8,9 and the buffer tank clamp 4,5, specifically, through welded connection between one end of strengthening rib 15 and the buffer tank clamp 4,5, the other end of strengthening rib 15 passes through welded connection with supporting platform 8,9, and strengthening rib 15 is to clamp boss 6,7 symmetrical arrangement to further consolidate the buffer tank clamp 4,5 and the connection of supporting platform 8,9, make supporting platform 8,9 load distribution more even, more stable.
The working process of the invention is as follows:
when the pulsation attenuator is used, the pulsation attenuator is connected into the pipeline system of the compressor, so that the pulsation of gas in the pipeline system can be sufficiently reduced, and the safe and stable operation of the pipeline system and equipment is ensured.
Fig. 4 is a graph showing the variation of the attenuation effect with the pulsation frequency in the air storage tank mode and the capacity-to-capacity mode, wherein the transmission coefficient represents the amplitude or intensity of the transmitted wave, and the smaller the transmission coefficient is, the better the pulsation attenuation effect is. The capacity tube capacity mode is mainly applied to the condition that the pulsation frequency is higher than the characteristic frequency of the Rong Guanrong pulsation attenuator, when the pulsation frequency is higher than the characteristic frequency of the capacity Guan Rongmo pulsation attenuator, the transmission coefficient can be rapidly reduced to 0, so that the effect of attenuating airflow pulsation is achieved, namely the capacity Guan Rong pulsation attenuator has the characteristic of 'low-frequency passing', and various frequency-doubled pulsation components higher than the characteristic frequency can be effectively attenuated. When the pulse frequency of the air storage tank mode is smaller than the characteristic frequency of the Rong Guanrong pulse attenuator, the transmission frequency of the air storage tank mode is lower than the transmission frequency of the pulse attenuator with the same volume, and good pulse attenuation effect can be achieved by applying the air storage tank mode.
Specifically, when the capacity Guan Rong mode is applied, the switching valve is closed, gas enters one side chamber from the gas inlet 13 of the buffer tank 1, flows through the outer cannula 2 and enters the other side chamber, and finally is discharged from the gas outlet 14, and the two chambers and the outer cannula 2 form a capacity-type pulsation damper, so that gas resonance occurs in the outer cannula through the outer cannula 2 to achieve the effect of damping pulsation of gas flow, the pulsation damper has a characteristic frequency, pulsation components of all times of frequency of the flowing gas above the characteristic frequency can be damped, the attenuation rate is increased by at least 65% compared with that of the buffer tank with the same volume, and the pulsation damping effect of the buffer tank is further improved. When the buffer tank mode is applied, the switching valve is opened, gas enters one side chamber from the gas inlet 13 of the buffer tank 1, then enters the other side chamber through the switching valve, finally is discharged from the gas outlet 14, and the switching valve is opened, wherein the two chambers are equivalent to a common buffer tank gas flow pulsation control device.
Application effect experiment:
(1) The numerical simulation calculation is carried out on the rapid-switching external-plug-in Rong Guanrong type pulsation attenuator by utilizing the PULS software based on the planar fluctuation theory and the transfer matrix method.
FIG. 5 is a graph comparing the simulation results of the damping effect of the buffer tank and the capacitor Guan Rongmo, wherein the pressure unevenness reflects the pulsation damping effect, the smaller the pressure unevenness is, the better the pulsation damping effect is, the compressor operates at 750 r.min < -1 >, and 1-4 nodes among 7 nodes of the model are selected from a pipeline section from an air inlet to a Rong Guanrong pulsation attenuator (buffer tank), namely a pipeline downstream of the capacitor Guan Rong pulsation attenuator (buffer tank); the 5-7 nodes are selected from the pipeline section from the volume Guan Rong pulsation attenuator (buffer tank) to the cylinder, namely the pipeline upstream from the volume Guan Rong pulsation attenuator (buffer tank). As can be seen from the figure, the pulsation attenuation effect of the buffer tank mode on the 5-7 nodes of the upstream pipeline is better than that of the capacitor Guan Rongmo; the pulsation damping effect of the capacitor Guan Rongmo on the 1-4 nodes of the downstream pipeline is obviously better than that of a buffer tank mode, and the pulsation damping effect is respectively improved by 90.03%, 91.67%, 84.98% and 84.98%. Therefore, due to the complexity of field applications and the need for different pulsation attenuation effects, a fast switching function between the two modes of the surge tank and the capacity Guan Rong pulsation attenuator is very necessary. In particular, the attenuation effect on downstream line pulsations is improved by a maximum of 91.67% when the capacity Guan Rong mode is applied.
(2) Capacity Guan Rongmo type attenuation effect experiment.
The exhaust capacity of the experimental compressor is 12m 3 ·min -1 Rated rotation speed 750 r.min -1 The excitation frequency is 12.5Hz and all frequency doubling thereof, the influence effect of structural parameters of the capacity-type pulsation attenuator of the capacity tube on pulsation attenuation can be obtained by controlling the capacity of the container, the length of the outer cannula and the inner diameter of the outer cannula and comparing the same capacity of the buffer tank as a reference, as shown in figure 6, the effect experiment is carried out on four schemes, and V represents the capacity/m of the container 3 L represents the length/m of the outer cannula and d represents the inner diameter/m of the outer cannula. Scheme one: v=0.03, l=3.0, d=0.035; scheme II: v=0.06, l=3.0, d=0.035; scheme III: v=0.06, l=1.9, d=0.035; scheme IV: v=0.06, l=3.0, d=0.05.
Fig. 6 is a graph showing the effect of structural parameters on the pulsation attenuation effect in the capacity-to-capacity mode, where the attenuation effect can be enhanced by increasing the volume and the length of the outer cannula. The characteristic frequency can be reduced and the attenuation frequency domain can be increased because the volume and the length of the outer cannula are increased. The inner diameter of the outer insertion tube is increased, so that the attenuation effect of the attenuator can be enhanced, and the characteristic frequency is increased by theoretically increasing the inner diameter of the outer insertion tube, but the resistance loss of the pipeline is reduced, the resonance energy is increased, and the attenuation effect of the attenuator is actually enhanced. When the capacity Guan Rong mode is actually applied, the attenuation effect of the attenuator can be improved by three methods of increasing the volume, the length of the outer cannula and the inner diameter of the outer cannula under the condition that the characteristic frequency is kept unchanged or reduced. Meanwhile, experimental results show that the Rong Guan capacity-type pulsation attenuation amplitude is improved by at least 65% compared with that of a buffer tank with the same capacity.
The Guan Rong pulsation attenuator capable of rapidly switching the outer cannula volume is mainly arranged in a pipeline system of a reciprocating compressor unit and is used for controlling airflow pulsation. In addition, the buffer tank of the existing airflow pulsation control device can be modified, the attenuation effect of the buffer tank is further improved, and the outer inserted pipe type structure enables machining and installation to be more flexible.
Of course, what has been described above is a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principle of the present invention, and these modifications and adaptations are also considered as protecting the scope of the present invention.
Claims (5)
1. The utility model provides a but quick switch over outer tube type Rong Guanrong type pulsation attenuator, it includes buffer tank (1) and outer tube (2), outer tube (2) are arranged into the S type, wherein, be equipped with diverter valve (3) in buffer tank (1) middle part, diverter valve (3) will buffer tank (1) inside is divided into two cavity (11, 12), diverter valve (3) have quick switching over function, and diverter valve 'S open and closed state corresponds pulsation attenuator' S gas holder mode and hold Guan Rongmo formula, and diverter valve opens and is the gas holder mode, as ordinary gas holder to the air current pulsation control; the switching valve is closed by a container Guan Rongmo, an external inserted pipe type Rong Guanrong pulsation attenuator is formed to control air flow pulsation, the switching valve (3) is designed by adopting a butt-clamping butterfly valve, a butterfly plate (17) of the butterfly valve is arranged in the diameter direction of a pipeline, and the valve is in a full-open state in the initial stage; the utility model provides a pulsation damping device for a gas storage tank, including cavity (11, 12), cavity (11) are equipped with cavity (12) and are equipped with gas inlet (13) respectively, cavity (11) bottom of one side, cavity (12) bottom of the opposite side is equipped with gas vent (14), outer pipe (2) are fixed outside of buffer tank (1) through outer pipe supporting part, outer pipe (2) are at gas holder (1) external connection, obtain the required sufficient length of pulsation damping, outer pipe supporting part includes supporting platform (8, 9) and buffer tank clamp (4, 5), wherein, outer pipe (2) are passed through outer pipe clamp (10) are installed on supporting platform (8, 9).
2. Pulsation attenuator according to claim 1, characterized in that the outer tube support member is arranged in the length direction of the buffer tank (1) and symmetrically with respect to the switching valve (3).
3. Pulsation damper according to claim 1, characterized in that the support platform (8, 9) is connected to the surge tank clamp (4) via the clamp boss (6, 7).
4. A pulsation damper according to claim 3, characterized in that between the support platform (8, 9) and the tank clamp (4, 5) there is also a stiffening rib (15).
5. A pulsation control method, characterized in that the pulsation damper according to any one of claims 1 to 4 is used, and has a gas tank mode and a capacity Guan Rong mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710795675.3A CN107882712B (en) | 2017-09-06 | 2017-09-06 | But quick switch outer cannula formula Rong Guanrong pulsation attenuator |
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| CN201710795675.3A CN107882712B (en) | 2017-09-06 | 2017-09-06 | But quick switch outer cannula formula Rong Guanrong pulsation attenuator |
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| CN107882712B true CN107882712B (en) | 2023-12-26 |
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