CN207298039U - The denoising device of piston valve - Google Patents
The denoising device of piston valve Download PDFInfo
- Publication number
- CN207298039U CN207298039U CN201721337093.2U CN201721337093U CN207298039U CN 207298039 U CN207298039 U CN 207298039U CN 201721337093 U CN201721337093 U CN 201721337093U CN 207298039 U CN207298039 U CN 207298039U
- Authority
- CN
- China
- Prior art keywords
- piston
- perforate
- housing
- denoising device
- piston valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Details Of Valves (AREA)
Abstract
The utility model belongs to denoising device, particularly relates to a kind of denoising device of piston valve.Including the housing equipped with export and import, it is axially fixed the piston cylinder for taper in housing and rear end, divide gas piston to be oriented to piston cylinder dynamic sealing to coordinate and driven by bar-link drive, its anterior side wall is equipped with the first perforate that is radially spaced and axially extending, its outside coordinates gas path on-off and inflow-rate of water turbine inside and outside control housing with housing outlets inner wall through dynamic sealing；Divide gas piston inner wall to be radially equipped with the varying diameter portion that caliber reduces in front of the first perforate, divide gas piston nose cover gab to include the central outlets being made of the second perforate for being distributed in its center and being spaced apart, the outer outlets being made of radially spaced the 3rd perforate for opening up and being distributed on the outside of central outlets.The advantages that the utility model efficiently solves that noise in existing product application process is big to wait technical barrier, effectively reduces caused noise during use, good economy performance.
Description
Technical field
The utility model belongs to denoising device, particularly relates to a kind of denoising device of piston valve.
Background technology
Piston valve is different from the butterfly valve and gate valve that are only used as pipeline cut-out, and piston valve can meet that various special adjust require,
Also there is reliable cut-out control function.Its regulatory function is to be axially moved by one similar to piston-like cylinder in valve chamber
Come what is realized.Medium enters housing in arcuation vertically, and the runner in piston valve is axisymmetric shape, will not be produced when fluid flows through
Turbulent flow.The change of flow area is axially to do linear motion along pipeline by a piston to realize.No matter piston is in what position, valve
The fluid section of intracavitary is ring-type, is shunk in exit to axle center.Piston valve has high negotiability, aperture and flow into line
Sexual intercourse, can be effectively prevented from cavitating and shaking.Inner casing has fairshaped water conservancy diversion rib to be connected with shell, and stainless steel pistons are reliable
Guiding is slided, and prevents to produce inclination or operation is not smooth.The end face globulate of inner casing upstream, makes current form a progressive formation,
Piston is operated with the crank connecting link in shell.
The main product of domestic market piston valve is that German valve manufacturer --- VAG companies manufacture, which is
Improve and develop on the basis of the needle-valve in the U.S., it is resulted from the 1940s, attaining the sixties in 20th century in maturation.
Produced from the 1960s to 2007 and be mounted with more than 4000 piston valve.Peace is introduced since the 1990s in China
Piston valve is filled, it is largely public using VAG in the engineering projects such as large hydraulic engineering, sewage disposal, water delivery and water generating at present
The product of department.
Environmental requirement is very necessary not only for general industrial enterprise, for producing the iron and steel enterprise of a large amount of three wastes particularly
Important, the main target of improvement is flue gas, airborne dust and noise.Flue gas and Dust Improvement are under modern technologies effect and the market access
Good effect is all achieved under the promotion of condition, noise is not yet administered at all only, and the noise of high-decibel seriously affects
Normal work, becomes iron and steel enterprise's thorny problem in the urgent need to address, the source that noise produces is exactly blast furnace coal gas
The pressure regulation valve group of pipe network end.
To solve the above problems, applicant discloses one in the utility model patent of Patent No. 201620106332.2
Kind combined type weakening noise reduction pressure regulation valve group, regulating valve are piston type regulating valve, and piston type regulating valve includes housing, piston cylinder, drive
Motivation structure and cylindric piston, the shape of housing is streamlined, and the front end of housing offers air inlet and rear end offers out
Gas port, piston cylinder are located in housing and are coaxially disposed with housing, form annular channel between piston cylinder and housing, before piston cylinder
Hold and connected for horizontally disposed V-shaped and openend towards rear end, the rear end of piston cylinder for cylindrical shape and rear end with front end, piston
Multiple slots are along the circumferential direction offered on the side wall of rear end, the front end of piston is located in piston cylinder and by driving mechanism in work
Being moved along the longitudinal direction in plug cylinder makes annular channel connect or disconnect with the gas outlet of housing rear end.The above-mentioned prior art is due to adopting
Existing butterfly valve is instead of with piston valve, obvious technological progress is achieved in terms of noise reduction, but the above-mentioned prior art is in reality
There are the following problems in：One is due to that part component structural is unreasonable in valve body when causing work easily because of structural vibration
The mechanical noise of generation；Two be due to that air pertormance caused by it is used for the valve chamber unreasonable structure that air-flow pressure drop disperses is made an uproar
Sound.
For the scope that applicant understands, the current country there is no national standard or professional standard to carry out piston valve performance indicator
Normalization limits.Based on the technical requirements to universal machine and valve, meet that the cooperation between parts is reliable, ensure equipment
Stable operation, realizes for effective control in gaseous material course of conveying, passes through reduction blast furnace coal reasonable in design
Noise caused by the pressure regulation valve group of gas pipe network end, is not only urgent in the difficult point and practical application of piston valve construction design
Need, while be also one of the main R＆D direction of piston valve in application process.
Applicant does not have found there be the document report close with the application in patent database at home by retrieval.
Utility model content
The purpose of this utility model is to provide a kind of denoising device of piston valve, fitted using the piston valve of the utility model
The noise in course of conveying simultaneously can be effectively reduced for the flow control to gaseous material.
The overall technology of the utility model is conceived：
The denoising device of piston valve, including the housing of export and import is offered, it is axially fixed in housing and rear end
For the piston cylinder of taper, divide gas piston to be driven from bar-link drive and used with piston cylinder with dynamic sealing guiding, divide gas to live
The anterior side wall of plug offers radially spaced distribution and the first perforate axially extended, divides gas piston nose to be covered with opening,
The outside of gas piston and the outlet inside wall of housing is divided to pass through dynamic sealing and coordinate the gas path on-off and inflow-rate of water turbine controlled inside and outside housing；Position
The opening bag for dividing gas piston inner wall to be radially equipped with the varying diameter portion that caliber reduces, dividing gas piston nose lid in front of the first perforate
Include the central outlets being made of the second perforate for being distributed in point gas piston nose lid center and being spaced apart, and by between radially
Separate the outer outlets for setting and being distributed in the 3rd perforate composition on the outside of central outlets.
The particular technique design of the utility model also has：
To improve the structural strength of housing, reduce in gases at high pressure course of conveying because machinery caused by mechanical oscillation is made an uproar
Sound, preferable technical implementation way are that the housing passes through split flange and sealing by left side structure body and right side structure body
Component realizes sealing fixing assembling.
To be further ensured that the stability and reliability of parts assembling, preferable technical implementation way is the company
The split flange for connecing left and right side structure is assembled using seam allowance.
The satisfaction that acts predominantly on of varying diameter portion rationally utilizes valve chamber structural change gas flow, reduces its flow velocity, described
Varying diameter portion section is in isosceles triangle.Design is easy to calculating and control of the satisfaction to medium inflow-rate of water turbine using the above structure.
The major design design for dividing the opening of gas piston nose lid is the principle to be throttled using series connection, effective scattered to reach
The design of fixed restriction that the purpose of valve chamber gas pressure drop is provided, preferable technical implementation way be, the second perforate is circumferentially etc.
Angle is spaced apart.
The technical implementation way being more highly preferred to is that the second perforate is the cylindricality pore structure of the tapered opening in outer end, and the 3rd opens
Hole is slot hole.
To ensure the stability of transmission mechanism, the mechanical noise therefore produced is further reduced, preferable technology is realized
Mode is that shaft one end of linkage and the power output end of power source coordinate, its other end extends and consolidates with inner walls
It is fixed.
Meet the structural strength of gusset and to the stability of strutting system of piston cylinder on the premise of, for increase gas with excess flow
And its flow velocity is reduced, preferable technical implementation way is that the ring flange on rear side of piston cylinder front opening passes through in gusset and housing
Wall is fixed.
For ease of the assembling of housing and the connection reliability of mating surface, the technical implementation way being more highly preferred to is gusset
Assemble and be bolted using seam allowance with ring flange.
To meet the structural strength of piston cylinder, it is set to be not likely to produce deformation, to improve the operation stability of equipment, preferably
Technical implementation way is that piston cylinder front portion side wall is equipped with the ring enhancement portion thickeied.
To verify the technique effect of the application, applicant carried out following contrast test：
First, the product for applicant in the utility model of Patent No. 201620106332.2
1st, test method：
It two volumes is 18m that will be3Batch can series connection, outlet installation DN900 existing piston valve, valve outlet installation
Two volumes are 20m3The gas tank of series connection, connects the import of gas tank outlet and batch can with φ 800mm pipelines and installs automatic control
Butterfly valve processed.Pressure value is scheduled on 2kg, that is, air pressure force value of connecting reaches 1kg, the series connection batch can exhaust of valve opens voluntarily forward end, supplement
Source of the gas.1 cun of ball valve is installed in the air inlet of batch can, and connects air compression station compressed air, the installation pressure gauge detection storage of ball valve side wall
Atmospheric pressure.Pressure value is set to 2kg (analog blast furnace ductwork pressure).Thus, the source of the gas of closed cycle is established, is transmitted by piston valve
Regulating flow, the noise of pressure and friction speed, vibration velocity.(noise measuring decibel instrument, vibration detection vibration gauge, two kinds of instrument
Device is all the instrument for detecting motor)
Preliminary examination is carried out after work in every is ready, piston valve is run to full off state first, butterfly door is automatically controlled and closes, beat
Opening ball valve is inflated compressed air to the batch can of series connection, and about 3h is 36m3It is 2kg that the batch can of volume, which is inflated to pressure, and operator presses
Commander in chief's password carries out piston valve, at this moment hears ear-piercing hiss, lasts about 2 seconds, and hiss stops.Automatically control butterfly
Valve is opened, and gas is returned to series connection batch can.6 meters away from piston valve of the personnel of detection noise, when the hiss screamed sounds, decibel instrument is directed toward
110 decibels (dial plate limit), 6 meters away from piston valve spacing of vibration gauge, vibration velocity (mm/s) during sound peak highest is up to 8 values.Scene other
Personnel whether there is resonant reaction for verification, and hand touches the batch can of series connection and the gas tank of series connection, and when the hiss screamed rises, both of which is trembled
It is dynamic, illustrate that vibration forms resonant reaction.
Above-mentioned experiment category destructive testing, seldom uses in normal production, control valve adjust be in certain scope, will not
Standard-sized sheet is fully closed, but applicant has therefrom obtained data, and the test data after can be used to is compared.
Destructive testing is finished, and experimental rig is transformed by the state-of-the-art configuration of iron-smelter, the Denso of piston valve is driven
It is dynamic to be changed to hydraulic cylinder, the regulating valve of DN800 is also changed to hydraulic cylinder, is equipped with a hydraulic station and a set of PRC automatic control systems,
By the system command solenoid valve, by automated programming all automatically control.
The method of experiment carries out simulation test by different furnace top pressures：
First scheme furnace top pressure is 1.5kg (400m3-650m3Blast furnace)：
Air inlet side (batch can series connection volume 36m3) pressure 2kg, go out gas side (gas tank series connection volume 40m3) pressure is 1.2kg, damage
The tolerance of mistake is by air compression station pipe network tonifying Qi.
Alternative plan furnace top pressure is 2kg (810m3-1430m3Blast furnace)：
Air inlet lateral pressure is 2.5kg, outlet lateral pressure 1.7kg.
Third program furnace top pressure is 2.5kg (1500m3-3200m3Blast furnace)：
Air inlet lateral pressure is 3kg, outlet lateral pressure 2.2kg.
After scheme determines, from low pressure to high pressure escalation trial, air compression station put into high gear night by air inlet side, go out gas side hold
Device inflate, to rated value after pressurize, wait daytime experiment, second day 8：30 automatically working personnel set PRC oneself of 1.5kg
Dynamicization program, instructs two hydraulic cylinders to be performed by order, and decibel instrument, vibration gauge test (steel plant's peace ring portion regulation by 10m spacing
Spacing).
Due to air inlet side volume 36m3, go out gas side volume 40m3, pressure difference 0.5kg, piston valve and regulating butterfly valve need to adjust two
The pressure difference of container, the pressure of balanced two containers.Hiss sounds immediately after piston valve starts, but has not been ear-piercing shout strangely
Sound.Piston valve hydraulic cylinder moves about after 2 minutes, and the pressure difference of two containers is balanced quickly, and noise disappears after equilibrium.Two container pressures
Inequality is absolute, and piston valve hydraulic cylinder moves about incessantly.In addition this experiment is to have borrowed the principle that gas can compress, artificial
Tonifying Qi, diffuse and cause unbalanced, tests control, the adjustment function of piston valve.Therefore each control system work is uninterruptedly.
2nd, experimental result：
Start the noise of moment in piston valve, decibel instrument test is 90 decibels of peak, and vibration velocity (mm/s) is 4.5.But
Noise is reduced to 60-70 decibels in pressure operation, and vibration velocity (mm/s) is 2.8.
2nd, for the piston valve in the utility model
1st, test method
Preliminary examination or destructive testing, by series connection batch can inflation 2kg, series connection gas tank inflation 1.5kg, automatically controls well,
Decibel instrument, vibration gauge are away from piston valve spacing 6m.Automatically control and carry out piston valve, hear hiss immediately, but be not ear-piercing monster
Cry, hiss stops after 4 seconds, into automatic Regulation program, normal operation.Decibel instrument pointer high level 70-75 when noise sounds
Decibel, vibration gauge sound peak height value vibration velocity (mm/s) 4, the vibrationless feel of container, pipeline, valve, i.e., do not resonate.
The preliminary examination of existing piston valve ear-piercing hiss of screaming is 2 seconds, is tested using the piston valve in the utility model
Hiss is 4 seconds, and the time has grown one times, and noise has almost subtracted one times, and the vibration velocity of vibration has subtracted one times.
Subsequent two arrange operator on duty by test technology respectively to 1.5kg grades, 2.0kg grades, 2.5kg grades of simulation works round the clock
Skill is tested, and clear stipulaties do detailed record to the temperature of piston valve band, decibel value, vibration velocity value per hour.
2nd, experimental result：
Two data that collate the minutes after the test round the clock are respectively：
Noise decibel value：50-60 decibels；
Vibration velocity (mm/s):1.8-2.
Being used for pressure regulation valve group using the piston valve of the utility model it can be seen from above contrast test can substantially reduce
Noise.
Applicant it should be noted that：
In the description of the utility model, term " interior ", " outer ", " axial direction ", " radial direction ", " front end ", " rear end ", " in
Centre ", " orientation or position relationship of the instruction such as " center ", " outside " be based on orientation shown in the drawings or position relationship, be only for
Easy to simplify description the utility model, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.In addition, term " first ", " the
Two ", " the 3rd " is only used for description purpose, and it is not intended that instruction or hint relative importance.
Technological progress acquired by the utility model is：
1st, a series of ingenious structure designs (including the piston that rear end is taper by valve chamber, valve body of the utility model
Cylinder, divide the opening of gas piston side wall and front end and the structure of varying diameter portion), and using the principle of series connection throttling, reach and be varied multiple times
Gas flow, gradually reduces the purpose of gas flow rate, while pressure drop is rationally dispersed in valve chamber and divides the fixed knot of gas piston
Flow structure, its structure design can not only effectively reduce air power noise caused by existing product valve body structure design defect
Big technical barrier, while there is preferable economy.
2nd, the structure design of gusset, on the premise of structural strength and stability of strutting system is met, further increases gas
Inflow-rate of water turbine, reduces gas flow rate, reduces airborne noise.
3rd, the structure design of shaft is changed to axis from semiaxis, is meeting that countershaft both ends effectively support positioning, reduce it
Because unbalance stress produce deformation while, the ingenious axial two-point locating for realizing piston cylinder, compared to for existing product into one
Step improves the reliability of the axially position of piston cylinder, effectively reduces because parts collide mechanical noise caused by resonance.
4th, the structure design of the ring flange of piston cylinder opening and the annular thickening with the piston cylinder side wall of link of boards
The structure design in portion, while structural strength is met, reduce further because of machine caused by parts fitment stability difference
Tool vibrates, and reduces mechanical noise.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the utility model.
Fig. 2 is that the utility model divides gas piston nose lid structure diagram.
Fig. 3 is that the utility model divides gas piston front portion structure schematic diagram.
Fig. 4 is A portions partial enlarged view in the utility model Fig. 1.
Fig. 5 is B portions partial enlarged view in the utility model Fig. 1.
Fig. 6 is the left view of Fig. 1.
Fig. 7 is the structure diagram of correlation test device in the utility model.
Reference numeral in attached drawing is as follows：
1st, piston cylinder；2nd, gas piston is divided；3rd, housing；4th, the first perforate；5th, varying diameter portion；6th, the second perforate；7th, the 3rd perforate；
8th, shaft；9th, gusset.
Embodiment
The utility model is described further with reference to embodiments, but should not be construed as the limit to the utility model
Fixed, the scope of protection of the utility model is subject to the content of claim record, any equivalent skill made according to specification
Art means are replaced, all without departing from the scope of protection of the utility model.
The overall structure of the present embodiment as shown, including the housing 3 for offering export and import, be axially fixed in
In housing 3 and rear end is the piston cylinder 1 of taper, divides gas piston 2 to be driven by bar-link drive and uses dynamic sealing with piston cylinder 1
It is oriented to and coordinates, divides the anterior side wall of gas piston 2 to offer radially spaced distribution and the first perforate 4 axially extended, divide gas to live
Fill in 2 drive end bearing brackets and be equipped with opening, divide the outside of gas piston 2 to coordinate with the outlet inside wall of housing 3 by dynamic sealing inside and outside control housing 3
Gas path on-off and inflow-rate of water turbine；2 inner wall of gas piston is divided radially to be equipped with the varying diameter portion that caliber reduces positioned at the front of the first perforate 4
5, divide the opening of 2 drive end bearing bracket of gas piston to include by being distributed in 2 drive end bearing bracket center of point gas piston and the second perforate 6 by being spaced apart
The central outlets of composition, and by the radially spaced outside for opening up and being distributed in the 3rd perforate 7 on the outside of central outlets and form
Outlet.
The housing 3 realizes the fixed dress of sealing by left side structure body and right side structure body by split flange and sealing ring
Match somebody with somebody.The split flange for connecting left and right side structure is coordinated using seam allowance.
5 section of varying diameter portion is in isosceles triangle.
Second perforate 6 circumferentially equiangularly spaced distribution, the second perforate 6 are the cylindricality pore structure of the tapered opening in outer end,
3rd perforate 7 is slot hole.
The power output end of 8 one end of shaft of linkage and power source coordinates, the extension of its other end and with 3 inner wall of housing
It is fixed.
Ring flange on rear side of 1 front opening of piston cylinder is fixed by gusset 9 and 3 inner wall of housing.
Gusset 9 is assembled and is bolted using seam allowance with ring flange.
The anterior side wall of piston cylinder 1 is equipped with the ring enhancement portion thickeied.
Claims (11)
1. the denoising device of piston valve, including offer the housing (3) of export and import, be axially fixed in housing (3) and
Rear end is the piston cylinder (1) of taper, divides gas piston (2) to be driven by bar-link drive and is led with piston cylinder (1) using dynamic sealing
To cooperation, divide the anterior side wall of gas piston (2) to offer radially spaced distribution and the first perforate (4) axially extended, divide gas
Piston (2) drive end bearing bracket is equipped with opening, divides the outside of gas piston (2) to coordinate with the outlet inside wall of housing (3) by dynamic sealing and controls
Gas path on-off and inflow-rate of water turbine inside and outside housing (3)；It is characterized in that divide gas piston (2) inner wall in front of the first perforate (4)
The varying diameter portion (5) that caliber reduces radially is equipped with, divides the opening of gas piston (2) drive end bearing bracket to include by being distributed in a point gas piston (2)
Drive end bearing bracket center and the central outlets for the second perforate (6) composition being spaced apart, and opened up and be distributed in by radially spaced
The outer outlets of the 3rd perforate (7) composition on the outside of central outlets.
2. the denoising device of piston valve according to claim 1, it is characterised in that the housing (3) is by left side structure body
And right side structure body realizes sealing fixing assembling by split flange and containment member.
3. the denoising device of piston valve according to claim 2, it is characterised in that the connection left and right side structure
Split flange is assembled using seam allowance.
4. the denoising device of piston valve according to claim 1, it is characterised in that described varying diameter portion (5) section is in isosceles
Triangle.
5. the denoising device of piston valve according to claim 1, it is characterised in that the second perforate (6) circumferentially angularly between
Every distribution.
6. the denoising device of the piston valve according to any one of claim 1-5, it is characterised in that the second perforate (6) is outer
Hold the cylindricality pore structure of tapered opening.
7. the denoising device of piston valve according to claim 6, it is characterised in that the 3rd perforate (7) is slot hole.
8. the denoising device of piston valve according to claim 1, it is characterised in that shaft (8) one end of linkage is with moving
The power output end in power source coordinates, its other end extends and fixed with housing (3) inner wall.
9. the denoising device of piston valve according to claim 1, it is characterised in that the method on rear side of piston cylinder (1) front opening
Blue disk is fixed by gusset (9) and housing (3) inner wall, and gusset (9) uses spoke structure.
10. the denoising device of piston valve according to claim 9, it is characterised in that gusset (9) uses seam allowance with ring flange
Assemble and be bolted.
11. the denoising device of the piston valve according to any one of claim 1-5,7-10, it is characterised in that piston cylinder (1)
Anterior side wall is equipped with the ring enhancement portion thickeied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721337093.2U CN207298039U (en) | 2017-10-17 | 2017-10-17 | The denoising device of piston valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721337093.2U CN207298039U (en) | 2017-10-17 | 2017-10-17 | The denoising device of piston valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207298039U true CN207298039U (en) | 2018-05-01 |
Family
ID=62272586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721337093.2U Active CN207298039U (en) | 2017-10-17 | 2017-10-17 | The denoising device of piston valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207298039U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701791A (en) * | 2017-10-17 | 2018-02-16 | 石家庄三环阀门股份有限公司 | The denoising device of piston valve and its application |
-
2017
- 2017-10-17 CN CN201721337093.2U patent/CN207298039U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701791A (en) * | 2017-10-17 | 2018-02-16 | 石家庄三环阀门股份有限公司 | The denoising device of piston valve and its application |
| CN107701791B (en) * | 2017-10-17 | 2023-10-24 | 石家庄三环阀门股份有限公司 | Noise reduction device of piston valve and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102829976B (en) | Simulator stand for exhaust characteristics of vehicle engine | |
| CN106499651B (en) | A kind of centrifugal compressor Non-steady characteristics platform and test method | |
| CN207298039U (en) | The denoising device of piston valve | |
| CN104583558B (en) | Turbocharger having compressor cooling arrangement and method | |
| CN105588702A (en) | Power system of flight test with power of low-speed wind tunnel model | |
| CN205280366U (en) | A exhaust apparatus for axial flow compressor tester | |
| CN107701791A (en) | The denoising device of piston valve and its application | |
| CN108644101A (en) | A kind of device for synchronism detection pump operation performance | |
| CN207437814U (en) | Improved piston valve | |
| CN201723314U (en) | Combustion gas turbine with outer water cooling device | |
| CN102235267A (en) | Gas turbine engine modified by using exservice turbofan engine through low-pressure crest truncation | |
| CN209655043U (en) | A kind of low-pressure fuel gas pipeline minute leakage on-line monitoring system | |
| CN107559444A (en) | Improved piston valve and its application | |
| CN208872360U (en) | A kind of Venturi nozzle | |
| CN106017908A (en) | Rotating turbine flow and cooling test device and method | |
| CN206439557U (en) | The hydrostatic compression testing device of pipeline with joint | |
| CN114136641B (en) | Exhaust device for heating and pressurizing air compressor tester | |
| CN206919945U (en) | A kind of adjustable Venturi tube | |
| CN105424392A (en) | Supercharged boiler test stand | |
| CN205120507U (en) | Expansion joint's hydrostatic pressing testing arrangement | |
| CN208919317U (en) | Fixture is blocked up at plastic pipe fitting pressure testing end | |
| CN210113386U (en) | Split type power turbine structure containing static pressure seal | |
| CN209671015U (en) | A kind of turbo-expander spiral case | |
| CN207701245U (en) | A kind of big flow liquid conveying system frequency run system | |
| CN208669358U (en) | Compact little volume flow high pressure ratio mixed-flow industrial turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |