CN104358304A - Volute device for realizing orderly water drainage and waterlogging prevention in cities - Google Patents
Volute device for realizing orderly water drainage and waterlogging prevention in cities Download PDFInfo
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- CN104358304A CN104358304A CN201410539279.0A CN201410539279A CN104358304A CN 104358304 A CN104358304 A CN 104358304A CN 201410539279 A CN201410539279 A CN 201410539279A CN 104358304 A CN104358304 A CN 104358304A
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- water
- generating means
- collecting well
- current screw
- city
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
Abstract
The invention discloses a volute casing device for realizing orderly water drainage and waterlogging prevention in cities. The device comprises underground pipe networks for cities, and water collecting wells communicated with the underground pipe networks, wherein the underground pipe networks are connected with a main pipeline, and water flow spiral movement generating devices are mounted at water outlets of the water collecting wells; the water flow spiral movement generating devices adopt volute structures and are provided with tangential water inlets and axial water outlets, the axial water outlets are communicated with water drainage pipes at the water outlet positions of the water collecting wells, and the tangential water inlets are used for guiding the water into an inner cavity of a volute casing in the tangential direction of the circumference of the side surface of the volute casing. The device can be used for effectively reducing the equivalent flow passing area of pipelines at the water outlets of the water collecting wells at high-elevation regions and the water flow speed of the inner parts of the pipelines, realizing the purpose of coordinating the water drainage flow amount in different regions, and contributing to relieving the waterlogging disasters caused by heavy rainfall in the cities.
Description
Technical field
The present invention relates to a kind of volute casing device realizing the orderly drainage waterlogging prevention in city.
Background technology
In urban sewerage and drainage system, the physical features significant difference of zones of different affects the drainability of respective regions drainage pipe and the drainage effect in heavy showers.Relevant theoretical according to hydrodynamics, under head pressure effect, the water flow in pipeline increases with the rising of head pressure.So when each discharge pipe line is same caliber, high elevation region is due to higher head pressure, and pipeline has more powerful drainability, in short-term during heavy showers, surface rain is drained fast by discharge pipe line after importing collecting well; And hypsography low-lying area head pressure is low, tubes rows outlet capacity is relatively weak, and rainwater is difficult to drain in time and be detained in a large number.Current China urban drainage pipe network layout mostly is " linker " pattern (namely in some areas, city, the drainage pipeline networks of high and low topography areas shares same main line), when rainfall exceedes the load of drainage pipeline networks, rainwater is excessive from hypsography low-lying region collecting well, causes effectiveness factors.On the other hand, surface rain from high elevation field flow orientation hypsography low-lying region, increases the weight of the burden of low lying areas drainage pipeline networks under gravity, increases the occurrence probability of low lying areas effectiveness factors.
In sum, when city meets with heavy showers in short-term, the draining burden that hypsography low-lying region pipe network faces is higher than high elevation region, and drainability is weaker than high elevation region.This hull-borne of network of underground is totally unfavorable to alleviation urban waterlogging.Unchanged descending under pipe network condition, suitably weakening the drainability in high elevation region, allowing hypsography low-lying region preferentially discharge is the effective way changing this hull-borne.
Summary of the invention
When to meet with heavy showers in city in order to solve, existing water drainage mode effectively can not limit the storm-water drainage speed in high elevation region, very easily cause the deficiency of low-lying region effectiveness factors, the invention provides a kind of effectively can limit high elevation region storm-water drainage speed, accomplish that hypsography low-lying area is preferentially discharged, realize the volute casing device of the orderly drainage waterlogging prevention in city.
The technical solution used in the present invention is:
Realize the volute casing device of the orderly drainage waterlogging prevention in city, it is characterized in that: the network of underground comprising city and the collecting well be communicated with described network of underground, described network of underground connects main line, the delivery port of described collecting well is provided with current screw generating means; Described current screw generating means is worm frame, described current screw generating means has tangential water inlet and the Axial-running Out mouth of a river, the described Axial-running Out mouth of a river is communicated with the gutter of the water outlet of described collecting well, and water is imported the inner chamber of spiral case by described tangential water inlet with the tangential direction of the side surface circumference of described spiral case.
Further, the current screw generating means being arranged on the delivery port of the collecting well of high elevation has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying.
The course of work of the present invention is as follows:
1, when rainfall intensity is less, the water yield entering collecting well is also corresponding less, not yet to drainage system build-up of pressure, without the need to regulating the rainwater flow of discharge pipe line.Now, the head in collecting well is lower, and water flow stationary is by current screw generating means.
2, along with the increase of rainfall intensity and rain time, when in collecting well, water level rises to certain altitude gradually, due to the effect of the inertia of current and the planform of current screw generating means, current form the screw around apparatus structure axis in device inside, now water velocity is not enough to maintain stable screw form, this screw is crumbled and fall after a period of time has passed, is formed afterwards again, goes round and begins again.The appearance of this forms of motion means that the water velocity component along outlet pipe axis reduces, the corresponding reduction of flow in collecting well outlet conduit, now current screw generating means is not yet full of by water, and its inside still has a certain amount of air, further reduces the actual area of passage of current.
3, when water level in collecting well raises further, current screw generating means is flooded completely, and current form stable screw in device inside and collecting well outlet conduit, and the movement velocity along outlet conduit axis reduces further.Meanwhile, a small amount of air is limited in the centre of screw current, and this will produce back pressure to current, and reduces the area of passage of current in drainage pipe.Under the acting in conjunction of above factor, the flow of discharging collecting well is effectively contained.
4, after rainfall terminates, along with the decline of water level in collecting well, in drainage pipe, the helical flow form of current fades away, and drainage system recovers normal condition.
When the short time concentrates rainfall, the temporary transient water storage of collecting well in high elevation region and this region is unlikely to cause local waterlogging.Urban waterlogging often shows indivedual low-lying regions repeatedly waterlogging, instead of the waterlogging of Zone Full.The present invention finds, it is unordered that the origin cause of formation of urban waterlogging comprises in draining order, and cause low-lying area sewerage smooth thus, and the storage capacity of the collecting well in high elevation region is not fully used, the whole efficiency of urban sewerage and drainage facility declines.The present invention creatively implements the effective management of urban sewerage and drainage facility in draining order, improves the service efficiency of urban sewerage and drainage facility.
Beneficial effect of the present invention is embodied in:
1, the present invention does not change the present situation (layout of drainage pipeline networks, design), at high elevation set of regions well outlet conduit, current screw generating means is installed, when collecting well middle water level reach a certain height, this device starts, work, tangential inlet structure makes current flow into drainage pipe in a spiral form, slow down flow rate of water flow, the drainability in restriction and reduction high elevation region, thus improve the drainability in hypsography low-lying region, the flow of the different physical features drainage pipe of automatic synchronization, realize the orderly draining of system, eliminate or alleviate the effectiveness factors that low lying areas are caused by heavy showers in short-term.Do not need the energy, invest low, instant effect.
2, the present invention can design the structure and performance parameters of each current screw generating means according to the distribution situation of city area underdrainage pipe network system, topography and geomorphology, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
3, because the true form in drainage pipe cross section and area remain unchanged, line clogging risk is decreased.
Accompanying drawing explanation
Fig. 1 is simplified model schematic diagram of the present invention.
Fig. 2 a is current screw generating means is the schematic appearance of worm frame.
Fig. 2 b is the internal construction schematic diagram of Fig. 2 a.
Fig. 2 c is the structural representation that Fig. 2 a is arranged in collecting well.
Fig. 2 d is the A-A schematic cross-section in Fig. 2 c.
Fig. 2 e is the B-B schematic cross-section in Fig. 2 c.
The axial schematic diagram of Fig. 3 a to be current screw generating means be frustum cone structure.
Fig. 3 b is the structural representation that Fig. 3 a is arranged in collecting well.
Fig. 3 c is the A-A schematic cross-section in Fig. 3 b.
Fig. 3 d is the B-B schematic cross-section in Fig. 3 b.
The axial schematic diagram of Fig. 4 a to be current screw generating means be column structure.
Fig. 4 b is the structural representation that Fig. 4 a is arranged in collecting well.
Fig. 4 c is the A-A schematic cross-section in Fig. 4 b.
Fig. 4 d is the B-B schematic cross-section in Fig. 4 b.
The axial schematic diagram of Fig. 5 a to be current screw generating means be oblique frustum cone structure.
Fig. 5 b is the structural representation that Fig. 5 a is arranged in collecting well.
Fig. 5 c is the A-A schematic cross-section in Fig. 5 b.
Fig. 5 d is the B-B schematic cross-section in Fig. 5 b.
The axial schematic diagram of Fig. 6 a to be current screw generating means be oblique circular cylinder structure.
Fig. 6 b is the structural representation that Fig. 6 a is arranged in collecting well.
Fig. 6 c is the A-A schematic cross-section in Fig. 6 b.
Fig. 6 d is the B-B schematic cross-section in Fig. 6 b.
Fig. 7 a is the current helical flow schematic diagram that current screw generating means brings out.
Fig. 7 b is the relation curve schematic diagram of head under the effect of current screw generating means and flow.
Detailed description of the invention
Embodiment 1
With reference to Fig. 1, Fig. 2 a to Fig. 2 e and Fig. 7 a and Fig. 7 b, realize the prevention waterlogging method of the orderly draining in city, the delivery port of the collecting well 2 of the network of underground 1 in city installs current screw generating means 4; Further, the current screw generating means being arranged on the delivery port of the collecting well of high elevation 21 has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying 22.
Realize the special equipment of the prevention waterlogging method of the orderly draining in city, the network of underground 1 comprising city and the collecting well 2 be communicated with described network of underground 1, described network of underground 1 connects main line 3, the delivery port of described collecting well 2 is provided with current screw generating means 4.
Preferably, described current screw generating means 4 is worm frames.
In common pipeline, head is directly proportional to the quadratic power of flow.But in current screw generating means, as shown in Figure 7b, flow and head present special corresponding relation, at certain section, head increase causes flow to decline on the contrary.
The current screw generating means being arranged on the delivery port of the collecting well of high elevation of the present invention has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying, the reduction of the flow of high elevation set of regions well is larger, therefore the drainability in hypsography low-lying region is improved, the flow of the different physical features drainage pipe of automatic synchronization, realize the orderly draining of system, eliminate or alleviate the effectiveness factors that low lying areas are caused by heavy showers in short-term.
Arrangement above for the eddy current genetic coefficient of current screw generating means is an overall principle, for some areas, can according to the pressing degree of the water drainage of the distribution situation of city area underdrainage pipe network system, topography and geomorphology and this area, design the structure and performance parameters of each current screw generating means, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
Embodiment 2
With reference to Fig. 1, Fig. 3 a to Fig. 3 d, Fig. 7 a and Fig. 7 b, realize the prevention waterlogging method of the orderly draining in city, the delivery port of the collecting well 2 of the network of underground 1 in city installs current screw generating means 4; Further, the current screw generating means being arranged on the delivery port of the collecting well of high elevation 21 has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying 22.
Realize the special equipment of the prevention waterlogging method of the orderly draining in city, the network of underground 1 comprising city and the collecting well 2 be communicated with described network of underground 1, described network of underground 1 connects main line 3, the delivery port of described collecting well 2 is provided with current screw generating means 4.
Preferably, described current screw generating means 4 has the shell of truncated cone-shaped, and there is the inner chamber of hollow, the smaller diameter end of described shell is facing to the delivery port of collecting well, major diameter end face deviates from the delivery port of collecting well and is arranged on collecting well inside, described current screw generating means has tangential water inlet 5 and the Axial-running Out mouth of a river 6, the described Axial-running Out mouth of a river is arranged on minor diameter end face, the described Axial-running Out mouth of a river is communicated with the gutter of the water outlet of described collecting well, described tangential water inlet is arranged on the side of major diameter end face, water is imported inner chamber with the tangential direction of the side surface circumference of described shell by described tangential water inlet.This device inner chamber convergent vertically, cause the air back pressure rising fast vertically, the current screw aggravation that are limited in position, screw middle of the stream, strengthen gradually the effect that slows down of current axial velocity component, the flow in device exit is significantly reduced.
In common pipeline, head is directly proportional to the quadratic power of flow.But in current screw generating means, as shown in Figure 7b, flow and head present special corresponding relation, at certain section, head increase causes flow to decline on the contrary.
The current screw generating means being arranged on the delivery port of the collecting well of high elevation of the present invention has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying, the reduction of the flow of high elevation set of regions well is larger, therefore the drainability in hypsography low-lying region is improved, the flow of the different physical features drainage pipe of automatic synchronization, realize the orderly draining of system, eliminate or alleviate the effectiveness factors that low lying areas are caused by heavy showers in short-term.
Arrangement above for the eddy current genetic coefficient of current screw generating means is an overall principle, for some areas, can according to the pressing degree of the water drainage of the distribution situation of city area underdrainage pipe network system, topography and geomorphology and this area, design the structure and performance parameters of each current screw generating means, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
Embodiment 3
With reference to Fig. 1, Fig. 4 a to Fig. 4 d, Fig. 7 a and Fig. 7 b, realize the prevention waterlogging method of the orderly draining in city, the delivery port of the collecting well 2 of the network of underground 1 in city installs current screw generating means 4; Further, the current screw generating means being arranged on the delivery port of the collecting well of high elevation 21 has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying 22.
Realize the special equipment of the prevention waterlogging method of the orderly draining in city, the network of underground 1 comprising city and the collecting well 2 be communicated with described network of underground 1, described network of underground 1 connects main line 3, the delivery port of described collecting well 2 is provided with current screw generating means 4.
Preferably, described current screw generating means 4 has columniform shell, and there is the inner chamber of hollow, a columniform bottom surface is towards the delivery port of collecting well, another bottom surface deviates from the delivery port of collecting well and is arranged on collecting well inside, described current screw generating means has tangential water inlet 5 and the Axial-running Out mouth of a river 6, the described Axial-running Out mouth of a river is arranged on columniform bottom surface, the described Axial-running Out mouth of a river is communicated with the gutter of the water outlet of described collecting well, described tangential water inlet is arranged on the side of the columniform bottom surface deviating from axially outlet, water is imported inner chamber with the tangential direction of the side surface circumference of described shell by described tangential water inlet.This device inner chamber length is vertically longer, and the intensity of current screw changes not obvious vertically, and flow slowly reduces in device.
In common pipeline, head is directly proportional to the quadratic power of flow.But in current screw generating means, as shown in Figure 7b, flow and head present special corresponding relation, at certain section, head increase causes flow to decline on the contrary.
The current screw generating means being arranged on the delivery port of the collecting well of high elevation of the present invention has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying, the reduction of the flow of high elevation set of regions well is larger, therefore the drainability in hypsography low-lying region is improved, the flow of the different physical features drainage pipe of automatic synchronization, realize the orderly draining of system, eliminate or alleviate the effectiveness factors that low lying areas are caused by heavy showers in short-term.
Arrangement above for the eddy current genetic coefficient of current screw generating means is an overall principle, for some areas, can according to the pressing degree of the water drainage of the distribution situation of city area underdrainage pipe network system, topography and geomorphology and this area, design the structure and performance parameters of each current screw generating means, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
Embodiment 4
With reference to Fig. 1, Fig. 5 a to Fig. 5 d, Fig. 7 a and Fig. 7 b, realize the prevention waterlogging method of the orderly draining in city, the delivery port of the collecting well 2 of the network of underground 1 in city installs current screw generating means 4; Further, the current screw generating means being arranged on the delivery port of the collecting well of high elevation 21 has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying 22.
Realize the special equipment of the prevention waterlogging method of the orderly draining in city, the network of underground 1 comprising city and the collecting well 2 be communicated with described network of underground 1, described network of underground 1 connects main line 3, the delivery port of described collecting well 2 is provided with current screw generating means 4.
Preferably, described current screw generating means 4 has the shell of oblique truncated cone-shaped, and there is the inner chamber of hollow, the smaller diameter end of described shell is facing to the delivery port of collecting well, major diameter end face deviates from the delivery port of collecting well and is arranged on collecting well inside, described current screw generating means has tangential water inlet 5 and the Axial-running Out mouth of a river 6, the described Axial-running Out mouth of a river is arranged on minor diameter end face, the described Axial-running Out mouth of a river is communicated with the gutter of the water outlet of described collecting well, described tangential water inlet be arranged on angle between bus and vertical direction less and on the side of major diameter end, water is imported inner chamber with the tangential direction of the side surface circumference of described shell by described tangential water inlet.This device inner chamber convergent in the horizontal direction, the air back pressure being limited in position, screw middle of the stream is caused to raise fast in the horizontal direction, current screw aggravates, and strengthen gradually the effect that slows down of current axial velocity component, the flow in device exit is significantly reduced.Under the effect of device non-axisymmetric shape, the projection of current screw on each cross section is no longer around same axis of symmetry.
In common pipeline, head is directly proportional to the quadratic power of flow.But in current screw generating means, as shown in Figure 7b, flow and head present special corresponding relation, at certain section, head increase causes flow to decline on the contrary.
The current screw generating means being arranged on the delivery port of the collecting well of high elevation of the present invention has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying, the reduction of the flow of high elevation set of regions well is larger, therefore the drainability in hypsography low-lying region is improved, the flow of the different physical features drainage pipe of automatic synchronization, realize the orderly draining of system, eliminate or alleviate the effectiveness factors that low lying areas are caused by heavy showers in short-term.
Arrangement above for the eddy current genetic coefficient of current screw generating means is an overall principle, for some areas, can according to the pressing degree of the water drainage of the distribution situation of city area underdrainage pipe network system, topography and geomorphology and this area, design the structure and performance parameters of each current screw generating means, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
Embodiment 5
With reference to Fig. 1, Fig. 6 a to Fig. 6 d, Fig. 7 a and Fig. 7 b, realize the prevention waterlogging method of the orderly draining in city, the delivery port of the collecting well 2 of the network of underground 1 in city installs current screw generating means 4; Further, the current screw generating means being arranged on the delivery port of the collecting well of high elevation 21 has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying 22.
Realize the special equipment of the prevention waterlogging method of the orderly draining in city, the network of underground 1 comprising city and the collecting well 2 be communicated with described network of underground 1, described network of underground 1 connects main line 3, the delivery port of described collecting well 2 is provided with current screw generating means 4.
Preferably, described current screw generating means 4 has the shell of oblique circular cylinder shape, and there is the inner chamber of hollow, a bottom surface of oblique circular cylinder shape is towards the delivery port of collecting well, another bottom surface deviates from the delivery port of collecting well and is arranged on collecting well inside, and described housing tilt is upwards arranged, described current screw generating means has tangential water inlet 5 and the Axial-running Out mouth of a river 6, the described Axial-running Out mouth of a river is arranged on the bottom surface of oblique circular cylinder shape, the described Axial-running Out mouth of a river is communicated with the gutter of the water outlet of described collecting well, described tangential water inlet is arranged on the side of the bottom surface of the oblique circular cylinder shape of deviating from the Axial-running Out mouth of a river, water is imported inner chamber with the tangential direction of the side surface circumference of described shell by described tangential water inlet.This device inner chamber length is in the horizontal direction longer, and the intensity of current screw changes not obvious in the horizontal direction, and flow slowly reduces in device.Under the effect of device non-axisymmetric shape, the projection of current screw on each cross section is no longer around same axis of symmetry.
In common pipeline, head is directly proportional to the quadratic power of flow.But in current screw generating means, as shown in Figure 7b, flow and head present special corresponding relation, at certain section, head increase causes flow to decline on the contrary.
The current screw generating means being arranged on the delivery port of the collecting well of high elevation of the present invention has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying, the reduction of the flow of high elevation set of regions well is larger, therefore the drainability in hypsography low-lying region is improved, the flow of the different physical features drainage pipe of automatic synchronization, realize the orderly draining of system, eliminate or alleviate the effectiveness factors that low lying areas are caused by heavy showers in short-term.
Arrangement above for the eddy current genetic coefficient of current screw generating means is an overall principle, for some areas, can according to the pressing degree of the water drainage of the distribution situation of city area underdrainage pipe network system, topography and geomorphology and this area, design the structure and performance parameters of each current screw generating means, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
Embodiment 6
Realize the prevention waterlogging method of the orderly draining in city, the delivery port of the collecting well only in the high elevation region in city installs current screw generating means.
It is identical with embodiment 1, embodiment 2, embodiment 3, embodiment 4 or embodiment 5 with embodiment.
The present embodiment can be applied as the easy implementation of one.
Arrangement above for the eddy current genetic coefficient of current screw generating means is an overall principle, for some areas, can according to the pressing degree of the water drainage of the distribution situation of city area underdrainage pipe network system, topography and geomorphology and this area, design the structure and performance parameters of each current screw generating means, really realize the orderly draining of this region underdrainage pipe network system, reach the target preventing low lying areas, city waterlogging.
Content described in this manual embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (2)
1. realize the volute casing device of the orderly drainage waterlogging prevention in city, it is characterized in that: the network of underground comprising city and the collecting well be communicated with described network of underground, described network of underground connects main line, the delivery port of described collecting well is provided with current screw generating means; Described current screw generating means is worm frame, described current screw generating means has tangential water inlet and the Axial-running Out mouth of a river, the described Axial-running Out mouth of a river is communicated with the gutter of the water outlet of described collecting well, and water is imported the inner chamber of spiral case by described tangential water inlet with the tangential direction of the side surface circumference of described spiral case.
2. realize the volute casing device of the orderly drainage waterlogging prevention in city as claimed in claim 1, it is characterized in that: the current screw generating means being arranged on the delivery port of the collecting well of high elevation has the eddy current genetic coefficient higher than the current screw generating means of the delivery port of the collecting well being arranged on low-lying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410539279.0A CN104358304A (en) | 2014-10-13 | 2014-10-13 | Volute device for realizing orderly water drainage and waterlogging prevention in cities |
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| CN201410539279.0A CN104358304A (en) | 2014-10-13 | 2014-10-13 | Volute device for realizing orderly water drainage and waterlogging prevention in cities |
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| CN104727435A (en) * | 2015-03-31 | 2015-06-24 | 武汉圣禹排水系统有限公司 | Universal type rotational flow and constant flow device |
| CN104746635A (en) * | 2015-03-31 | 2015-07-01 | 武汉圣禹排水系统有限公司 | Rotational flow and constant flow device |
| CN106049649A (en) * | 2016-07-27 | 2016-10-26 | 水利部产品质量标准研究所 | Worm-shaped stagnating device with guiding plate |
| CN108978835A (en) * | 2018-07-30 | 2018-12-11 | 水利部杭州机械设计研究所 | Eddy flow cut-off equipment with blowdown pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108978835A (en) * | 2018-07-30 | 2018-12-11 | 水利部杭州机械设计研究所 | Eddy flow cut-off equipment with blowdown pipe |
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Application publication date: 20150218 |