CN113833872B - Device and method for adjusting local flow velocity of pipeline - Google Patents
Device and method for adjusting local flow velocity of pipeline Download PDFInfo
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- CN113833872B CN113833872B CN202110876192.2A CN202110876192A CN113833872B CN 113833872 B CN113833872 B CN 113833872B CN 202110876192 A CN202110876192 A CN 202110876192A CN 113833872 B CN113833872 B CN 113833872B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/04—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members
- F16K3/06—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages
- F16K3/08—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages with circular plates rotatable around their centres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
- F16K27/045—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members with pivotal obturating members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding Valves (AREA)
Abstract
The invention discloses a device and a method for adjusting local flow velocity of a pipeline, wherein an adjustable valve plate and a fixed valve plate are arranged in a valve body, the adjustable valve plate and the fixed valve plate are adopted to adjust the flow area of the pipeline, an inner double-layer flow space and an outer double-layer flow space are built by a double-channel sleeve, and the inner flow space and the outer flow space are mutually independent; the adjustable valve plate rotates around the shaft under the condition of external driving; the flow area of the outer layer flow space is adjusted by changing the overlapping degree of the adjustable valve plate and the fixed valve plate; under the necessary condition, the outer-layer through-flow space can be completely closed, and only the inner-layer through-flow space is reserved, so that the condition that the low flow rate of working media in a pipeline influences the normal operation of related systems under the working condition of small flow is avoided.
Description
Technical Field
The invention belongs to the fields of thermal power generation and atomic energy, and particularly relates to a device and a method for adjusting local flow velocity of a pipeline.
Background
In recent years, the installation scale of wind power and photovoltaic new energy is continuously increased, the whole power consumption scale is greatly improved, and the grid peak regulation contradiction is increasingly prominent. In order to relieve the contradiction of the difference adjustment gap, improve the peak-shaving capacity of the general-dispatching unit, and continuously formulate and perfect the technical specification of the depth peak-shaving on the basis of summarizing the depth peak-shaving work by the dispatching control center in each place. The peak regulating depth of the public coal-fired generator set which is required to be regulated by more than 30 kilowatts in partial areas reaches 40% of rated output of the unit.
Individual regions have explored the goal of depth peaking further down to 30%, possibly even up to 20% in the future. Because of this influence, many systems that have certain requirement to working medium velocity of flow all probably face the condition that operating condition surpassed the design scope, take the temperature reduction system of high temperature steam as an example, the steam velocity of flow in the system is too low, can lead to steam-water heat transfer insufficient, influences and adjusts quality and operation safety.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a device and a method for adjusting the local flow rate of a pipeline, so as to solve the technical problems that the steam flow rate in a system in the prior art is too low, and the adjusting quality and the operation safety are affected.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the device for adjusting the local flow velocity of the pipeline comprises a valve body, wherein a valve rod is inserted into the axis of the valve body, and the upper end of the valve rod is connected with a power device; the side end of the upper part of the valve body is provided with a fluid inlet, the lower end of the valve body is provided with a fluid outlet,
the lower end of the valve rod is connected with a transmission shaft, and the lower end of the transmission shaft is connected with an adjustable valve plate; the lower side of the adjustable valve plate is provided with a fixed valve plate, and the lower side of the fixed valve plate is provided with a double-flow-passage sleeve;
the adjustable valve plate is an annular plate, the annular part is an upper outer annular plate, a plurality of upper through holes are formed in the plate surface of the upper outer annular plate, the upper through holes penetrate through the upper surface and the lower surface of the upper outer annular plate, and the part between the upper through holes is an upper interception block;
the fixed valve plate is an annular plate, the annular part is a lower outer annular plate, a plurality of lower through holes are formed in the plate surface of the lower outer annular plate, the lower through holes penetrate through the upper surface and the lower surface of the lower outer annular plate, and the part between the lower through holes is a lower interception block;
the diameter of the inner hole of the upper outer ring plate is equal to that of the inner hole of the lower outer ring plate, the number of the upper intercepting blocks is equal to that of the lower through holes, and the area of the lower end face of the upper intercepting block is larger than that of the upper end face of the lower through hole; the number of the lower intercepting blocks is equal to that of the upper through holes, and the area of the upper end face of the lower intercepting blocks is larger than that of the lower end face of the upper through holes;
the double-flow-passage sleeve comprises an inner sleeve and an outer sleeve which are coaxial, the inner sleeve is sleeved in the outer sleeve, the diameter of the inner sleeve is equal to that of the lower outer ring plate, and a fluid outlet is arranged below the double-flow-passage sleeve.
The invention further improves that:
preferably, the center of the upper outer ring plate is provided with a center ring, the center ring is connected with the transmission shaft, and the center ring is connected with the upper outer ring plate through a plurality of upper connecting plates.
Preferably, the center of the lower outer ring plate is provided with a supporting shaft, the supporting shaft is arranged at the lower side of the center ring, and the supporting shaft is connected with the lower outer ring plate through a lower connecting plate.
Preferably, the area of the upper end surface of the upper through-flow opening is larger than the area of the lower end surface.
Preferably, the upper outer ring plate is sleeved in a bearing, and the outer side wall of the bearing is connected with the inner side wall of the valve body.
Preferably, the inner sleeve and the outer sleeve are connected by a bottom web.
Preferably, the upper end of the valve body is connected with an inlet end valve cover, and the valve rod passes through the center of the inlet end valve cover.
Preferably, the valve rod is inserted into the valve cover at the inlet end and is provided with a filler, the upper side of the filler is provided with a filler pressing sleeve, and the upper side of the filler pressing sleeve is provided with a filler pressing plate.
Preferably, the inner end of the fluid inlet is provided with a sleeve, and the inner end of the sleeve is in contact with the transmission shaft.
The method based on the device for adjusting the local flow rate of the pipeline is characterized in that the overlapped part between the upper through-flow opening and the lower through-flow opening is adjusted by rotating the adjustable valve plate, so that the flow rate of fluid is controlled; specifically, fluid flows from the fluid inlet into the valve body;
when the upper through flow opening is communicated with the lower through flow opening, fluid firstly passes through the inner ring and the upper through flow opening of the upper outer ring plate, then passes through the inner ring and the lower through flow opening of the lower outer ring plate, and then flows out of the fluid outlet through the inner sleeve and the outer sleeve;
when the upper through flow port and the lower through flow port are isolated, fluid flows through the inner ring of the upper outer ring plate, the inner ring of the lower outer ring plate and the inner sleeve in sequence and flows out of the fluid outlet.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a device for adjusting local flow velocity of a pipeline, which is characterized in that an adjustable valve plate and a fixed valve plate are arranged in a valve body, the adjustable valve plate and the fixed valve plate are adopted to adjust the flow area of the pipeline, an inner double-layer flow space and an outer double-layer flow space are built by a double-flow sleeve, and the inner flow space and the outer flow space are mutually independent; the adjustable valve plate is connected with the valve rod through an adjustable valve plate transmission shaft, and the driving end of the valve rod can be connected with a proper actuating mechanism or a hand wheel through a component to drive the valve rod; the adjustable valve plate rotates around the shaft under the condition of external driving; the flow area of the outer layer flow space is adjusted by changing the overlapping degree of the adjustable valve plate and the fixed valve plate; the double-flow-passage sleeve is integrally formed and is not rigidly connected with the valve body, so that larger stress generated by inconsistent expansion of the sleeve and the valve body under the condition of partial steam admission is avoided; under the necessary condition, the outer-layer through-flow space can be completely closed, and only the inner-layer through-flow space is reserved, so that the condition that the low flow rate of working media in a pipeline influences the normal operation of related systems under the working condition of small flow is avoided. According to the device and the method for adjusting the local flow velocity of the pipeline, on the basis of basically keeping the existing pipeline arrangement, a small-caliber bypass is not additionally arranged, only the local device and the pipeline assembly are added, the workload of operators is prevented from being obviously increased, or a system is excessively complicated, and the total space occupied by the system is basically kept unchanged.
Further, the whole adjustable valve plate is driven to rotate by connecting the central ring with the transmission shaft.
Further, the middle of the fixed valve plate is provided with a supporting shaft, and on one hand, the fixed valve plate is connected with the lower outer ring plate and can support the center ring.
Further, the adjustable valve plate is sleeved in the bearing, so that the adjustable valve plate can rotate relative to the valve body.
Further, the inner sleeve and the outer sleeve are connected, so that the whole double-flow-passage sleeve is more rigid.
Further, the valve cover at the inlet end is provided with a filler, so that good sealing performance of the valve rod during movement is ensured.
Further, the sleeve has supporting and guiding functions on the rotating shaft.
The invention also discloses a method based on the device for adjusting the local flow velocity of the pipeline, which adopts the adjustable valve plate and the fixed valve plate to adjust the flow area of the pipeline, and is assisted by the double-channel sleeve to establish an inner double-layer flow space and an outer double-layer flow space, wherein the inner flow space and the outer flow space are mutually independent; by the method for adjusting the local flow velocity of the pipeline, the flow velocity of the working medium in the pipeline can be adjusted when necessary, and the working condition range of the system which needs the flow velocity of the working medium to be in a certain interval and can normally run can be expanded. Compared with the conventional method for arranging a small-caliber bypass to improve the flow rate of working media, the method for adjusting the local flow rate of the pipeline does not need to additionally arrange the bypass, reduces the investment cost of corresponding pipelines, pipe fittings, valves and the like, reduces the workload of corresponding operation, overhaul, maintenance and the like, and has clear system and simple pipeline; the space is saved, a bypass does not need to be additionally arranged, the site maintenance and inspection space is occupied, and the site advantage of compact arrangement and space shortage is obvious; the system is simplified, and the problems of two-way system switching and the like related to a double pipeline system are avoided; the waste of working media is reduced, and as the switching of a double-pipeline system does not exist, the conditions of heating pipes, drainage and the like in the switching process are avoided, and the working media are saved; the automatic control of the flow rate can be realized, the workload of operators is reduced, and the working medium flow rate in a pipeline is automatically adjusted remotely by matching with an executing mechanism under the condition that the system flow is monitored to be too low and the working medium flow rate can not meet the requirement through reasonably designed measuring point arrangement and control logic;
drawings
FIG. 1 is a front view in cross-section of the device of the present invention;
FIG. 2 is a cross-sectional isometric view of the device of the present invention;
FIG. 3 is a cross-sectional side view of the device of the present invention;
FIG. 4 is a cross-sectional top view of the device of the present invention;
FIG. 5 is an assembled isometric view of the adjustable valve plate, fixed valve plate and dual-channel sleeve of the present invention;
FIG. 6 is an assembled top view of the adjustable valve plate, fixed valve plate and dual-flow sleeve of the present invention;
FIG. 7 is an exploded view of the assembly of the adjustable valve plate, fixed valve plate and dual-channel sleeve of the present invention;
wherein, 1-valve rod; 2-packing pressing plate fastening nuts; 3-a packing pressing plate fastening bolt; 4-a packing press plate; 5-packing pressing sleeve; 6-filling; 7-an inlet end valve cover; 8-an inlet end valve cover fastening bolt; 9-an inlet end valve cover fastening nut; 10-a valve body; 11-a sleeve; 12-a transmission shaft; 13-an adjustable valve plate bearing; 14-an adjustable valve plate; 15-fixing a valve plate; 16-a dual-channel sleeve; 17-outlet end valve cover; 18-an outlet end valve cover fastening nut; 19-an outlet end valve cover fastening bolt; 20-fluid inlet; 21-a fluid outlet; 7-1-upper part; 7-2-lower part; 7-3-a first through hole; 10-1-a second through hole; 14-1-center circle; 14-2-upper connection plates; 14-3-upper outer ring plate; 14-4-upper vent; 14-5-upper shutoff blocks; 15-1 supporting shaft; 15-2-lower connection plates; 15-3-lower outer ring plate; 15-4-lower through-flow openings; 15-5-lower shutoff blocks; 16-1-an inner sleeve; 16-2-outer sleeve; 16-3-annular cavity; 16-4-bottom connection plate.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, 2, 3 and 4, the present invention discloses a device and method for adjusting a local flow rate of a pipe, the device includes a valve body 10, an upper end surface of the valve body 10 is connected with an inlet-end valve cover 7 through 4 inlet-end bolt structures, the inlet-end valve cover 7 includes an upper portion 7-1 and a lower portion 7-2 which are integrally connected and coaxial, and a diameter of the upper portion 7-1 is smaller than a diameter of the lower portion 7-2. Each inlet end bolt structure includes an inlet end bonnet fastening bolt 8 and an inlet end bonnet fastening nut 9, the inlet end bonnet fastening bolt 8 penetrating through the lower portion 7-2 and into the valve body 10, the inlet end bonnet fastening nut 9 securing the inlet end bonnet fastening bolt 8.
The inside of entrance end valve gap 7 has been seted up first through-hole 7-3, first through-hole 7-3 runs through entrance end valve gap 7, valve rod 1 inserts in first through-hole 7-3, be provided with packing 6 between the entrance of valve rod 1 and first through-hole 7-3, the upper portion of first through-hole 7-3 is provided with packing press cover 5, the upper portion of packing press cover 5 is provided with packing clamp plate 4, connect through the bolt structure between packing clamp plate 4 and the entrance end valve gap 7, first bolt structure includes packing clamp plate fastening nut 2 and packing clamp plate fastening bolt 3, packing clamp plate fastening bolt 3 and packing clamp plate fastening nut 2 cooperation are with packing clamp plate 4 and entrance end valve gap 7 connection.
The upper side wall of the valve body 10 is provided with a fluid inlet 20, the inner end of the fluid inlet 20 is provided with a sleeve 11 protruding inwards, the sleeve 11 is contacted with the transmission shaft 12, and the interior of the valve body 10 is provided with a second through hole 10-1 along the axial direction.
A transmission shaft 12, an adjustable valve plate 14, a fixed valve plate 15 and a double-flow-passage sleeve 16 are sequentially arranged in the second through hole 10-1 from top to bottom.
More specifically, the upper portion of the transmission shaft 12 is connected to the lower end of the valve stem 1, and the lower portion of the transmission shaft 12 is connected to the center portion of the adjustable valve plate 14. The fluid inlet 20 is opposite the drive shaft 12.
Referring to fig. 5, 6 and 7, the adjustable valve plate 14 is sleeved in the inner ring of the bearing 13, and the outer ring of the bearing 13 is fixedly connected with the valve body 10, so that the adjustable valve plate 14 can rotate relatively to the valve body 10. The adjustable valve plate 14 is of a circular ring plate structure and comprises a center ring 14-1 and an upper outer ring plate 14-3 which are arranged at the center of a circle, the center ring 14-1 and the upper outer ring plate 14-3 are fixedly connected through a plurality of upper connecting plates 14-2, the upper connecting plates 14-2 are arranged around the circumference of the inner ring 14-1 in a uniformly-distributed manner, a plurality of upper through openings 14-4 are formed in the upper outer ring plate 14-3, each upper through opening 14-4 penetrates through the upper surface and the lower surface of the upper outer ring plate 14-3, the upper through openings 14-4 are uniformly arranged around the circumference of the upper outer ring plate 14-3, the cross section of the upper through openings 14-4 is in a fan-shaped manner along the plane cross section of the upper outer ring plate 14-3, the area of the upper end face of the upper through opening 14-4 is larger than the area of the lower end face, namely, two side walls of the upper through openings 14-4 are inclined relative to the vertical direction, so that air flow easily flows into the upper through openings 14-4, the upper through openings 14-4 are arranged uniformly-distributed in a uniformly-distributed manner around the circumference of the upper surface of the upper through openings 14-3, the upper through openings 14-5 are arranged in a uniformly-distributed manner, and the area between adjacent upper through openings 14-5 is smaller than the upper end faces of the upper through opening 14-5. The center ring 14-1 is adapted for fixed connection with the drive shaft 12. The upper outer ring plate is fixedly sleeved in the inner side wall of the bearing 13, and the outer side wall of the bearing 13 is connected with the inner side wall of the valve body 10.
The lower part of the adjustable valve plate 14 is provided with a fixed valve plate 15, the outer side wall of the fixed valve plate 15 is fixedly connected with the valve body 10, the main body structure of the fixed valve plate 15 is a circular ring plate structure, a supporting shaft 15-1 is arranged at the center of the main body structure, a lower outer ring plate 15-3 surrounds the supporting shaft 15-1, the supporting shaft 15-1 and the lower outer ring plate 15-3 are connected through a plurality of lower connecting plates 15-2, and the lower connecting plates 15-2 are equally arranged around the circumference of the supporting shaft 15-1; the support shaft 15-1 is used for supporting the center ring 14-1, and the outer diameter of the center ring 14-1 is equal to the diameter of the support shaft 15-1. The width of the lower outer ring plate 15-3 is equal to the width of the upper outer ring plate 14-3, a plurality of lower through holes 15-4 are formed in the lower outer ring plate 15-3, the lower through holes 15-4 are uniformly distributed along the circumferential direction of the lower outer ring plate 15-3, and the lower through holes 15-4 penetrate through the upper surface and the lower surface of the lower outer ring plate 15-3; along the plane section of the lower outer ring plate 15-3, the section of each lower through-flow opening 15-4 is in a fan ring shape, and the part between two adjacent lower through-flow openings 15-4 is a lower shut-off block 15-5.
In order to ensure complete shutoff by the cooperation between the adjustable valve plate 14 and the fixed valve plate 15, the upper end surface area of the lower shutoff block 15-5 is larger than the lower end surface area of the upper through-flow port 14-4, and under the condition that the widths of the adjustable valve plate 14 and the fixed valve plate 15 are equal, namely, the inner arc length of the lower shutoff block 15-5 is larger than the inner arc length of the upper through-flow port 14-4, and the outer arc length of the lower shutoff block 15-5 is larger than the outer arc length of the upper through-flow port 14-4; similarly, the area of the upper shutoff block 14-5 is larger than the area of the lower vent 15-4.
The fixed valve plate 15 is fixedly arranged on the double-channel sleeve 16, the double-channel sleeve 16 comprises an inner sleeve 16-1 and an outer sleeve 16-2 which are coaxial, the inner sleeve 16-1 is sleeved inside the outer sleeve 16-2, the diameter of the inner sleeve 16-1 is equal to the inner diameter of the lower outer ring plate 15-3, namely, the distance between the inner sleeve 16-1 and the outer sleeve 16-2 is equal to the width of the lower outer ring plate 15-3, the part between the inner sleeve 16-1 and the outer sleeve 16-2 is an annular cavity 16-3, the inner sleeve 16-1 and the outer sleeve 16-2 are connected through a plurality of bottom connecting plates 16-4, the bottom connecting plates 16-4 are equally arranged in the annular cavity 16-3 around the circumference of the inner sleeve 16-1, and the outer sleeve 16-2 is arranged in the second through hole 10-1.
The bottom of the second through hole 10-1 is a fluid outlet 21, the lower end of the valve body 10 is fixedly connected with the outlet end valve cover 17 through an outlet end bolt structure, the outlet end bolt structure comprises an outlet end valve cover fastening nut 18 and an outlet end valve cover fastening bolt 19, the outlet end valve cover fastening bolt 19 passes through the outlet end valve cover 17 to be inserted into the lower end of the valve body 10, and the outlet end valve cover fastening bolt 19 is fastened through the outlet end valve cover fastening nut 18.
The working principle of the invention is as follows:
after the fluid enters from the fluid inlet 20, the fluid flows into the second through hole 10-1 along the sleeve 11, the valve rod 1 drives the transmission shaft 12 to rotate by rotating the valve rod 1, the transmission shaft 12 drives the adjustable valve plate 14 to rotate relative to the valve body 10, the flow rate of the fluid sequentially passing through the upper through hole 14-4 and the lower through hole 15-4 is adjusted by adjusting the overlapping degree between the adjustable valve plate 14 and the fixed valve plate 15, and the fluid simultaneously flows into the fluid outlet 21 from the inner sleeve 16-1 and the annular cavity 16-3.
When adjusted to a certain angle, the flow rate is maximum, and when adjusted to another angle, the adjustable valve plate 14 and the fixed valve plate 15 are completely closed, so that fluid cannot flow out of the annular cavity 16-3, and only flows into the fluid outlet 21 from the inner sleeve 16-1.
The adjustable valve plate 14 and the fixed valve plate 15 are used for adjusting the pipeline flow area, and the double-flow sleeve 16 is used for establishing an inner double-layer flow space and an outer double-layer flow space, wherein the inner flow space and the outer flow space are mutually independent; the adjustable valve plate 14 is connected with the valve rod 1 through a transmission shaft 12, and the driving end of the valve rod 1 can be connected with a proper actuating mechanism or a hand wheel through an assembly to drive the valve rod; the adjustable valve plate 12 rotates around the shaft under the external driving condition; the flow area of the outer layer through-flow space is adjusted by changing the overlapping degree of the adjustable valve plate 14 and the fixed valve plate 15; the double-runner sleeve 16 is integrally formed and is not rigidly connected with the valve body, so that larger stress generated by inconsistent expansion of the sleeve and the valve body under the condition of partial steam admission is avoided; under the necessary condition, the outer-layer through-flow space can be completely closed, and only the inner-layer through-flow space is reserved, so that the influence on the normal operation of related systems due to the fact that the flow speed of working media in a pipeline is too low under the working condition of small flow is avoided.
When the system operates, parameters such as flow, temperature, pressure and the like of working media in the pipeline system can be monitored through a meter which is already in the pipeline system, the flow rate of the working media can be obtained through calculation of the measured parameters such as flow, pressure, temperature and the like, and when the flow rate is lower than the operation requirement of the system, if the flow rate is driven by an actuating mechanism, the overlapping degree of an adjustable valve plate and a fixed valve plate can be remotely adjusted, the flow area of an outer-layer through-flow space can be adjusted, and the flow rate of the working media in the pipeline can be improved; if the hand wheel is adopted for driving, the overlapping degree of the adjustable valve plate and the fixed valve plate can be manually adjusted on site, the flow area of the outer-layer flow space can be adjusted, and the flow speed of working medium in the pipeline can be improved.
For the condition of driving by adopting an executing device, the operation can automatically control the flow rate under the condition of need through the reasonably designed measuring point arrangement and control logic, so that the workload of operators in the flow rate adjusting process is reduced.
Examples
Taking an example of a device for adjusting the local flow rate of a pipeline by adopting the method, the schematic diagram of the device is shown in the attached drawing. Common steam supply parameters of 1.8MPa and 300 ℃ are selected as working medium parameters. Taking DN400 pipeline as an example, the flow capacity of the working medium is about 194t/h according to the maximum flow rate of 60 m/s. For a system needing temperature and pressure reduction, the operation range should meet 30% -100% of design flow according to relevant standards. In this example, the system operation range is about 58t/h to 194t/h, and when the system flow is too low, the temperature and pressure reducing device may not operate normally.
The device for adjusting the local flow velocity of the pipeline by adopting the method establishes a double-layer through-flow space through the adjustable valve plate, the fixed valve plate and the double-flow sleeve, wherein the inner layer is about DN300, the outer layer is about DN500, the overlapping area of the adjustable valve plate and the fixed valve plate is about 100% under the condition that the outer-layer through-flow space is opened, the sum of the inner-layer through-flow area and the outer-layer through-flow area is equivalent to that of the pipeline of DN400, the maximum through-flow capacity of the system can be achieved, and the operation range of the system is as high as 58t/h to 194t/h; under the condition that the outer-layer through-flow space is closed, the adjustable valve plate and the fixed valve plate are hardly overlapped, the outer-layer through-flow space is closed, only the inner-layer through-flow space of the system allows working media to pass through, estimation is carried out by referring to the maximum flow velocity, and the operation range of the system is about 95 t/h-28.5 t/h; in summary, under the condition that the working medium parameters are the same and the operation requirements are consistent, the operation range of the system is expanded from 58t/h to 194t/h to 28.5t/h to 194t/h, namely, from 40 to 100 percent of design flow to 15 to 100 percent of design flow, and the effect is remarkable.
The invention has the advantages that the current deep peak regulation requirements for the power industry are increasingly strict, the operation range of the unit and auxiliary equipment thereof is required to be continuously expanded, and after the invention is adopted, the operation range of the system with certain requirements for the flow rate of working media can be used for deeply regulating the peak regulation requirements, thereby obviously improving the operation state of part of the system under the working condition of low flow rate of working media and providing support for the stable and reliable operation of the system.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The device for adjusting the local flow rate of the pipeline is characterized by comprising a valve body (10), wherein a valve rod (1) is inserted into the axis of the valve body (10), and the upper end of the valve rod (1) is connected with a power device; the upper part side end of the valve body (10) is provided with a fluid inlet (20), the lower end of the valve body (10) is provided with a fluid outlet (21),
the lower end of the valve rod (1) is connected with a transmission shaft (12), and the lower end of the transmission shaft (12) is connected with an adjustable valve plate (14); the lower side of the adjustable valve plate (14) is provided with a fixed valve plate (15), and the lower side of the fixed valve plate (15) is provided with a double-flow-passage sleeve (16);
the adjustable valve plate (14) is an annular plate, the annular part is an upper outer annular plate (14-3), a plurality of upper through holes (14-4) are formed in the plate surface of the upper outer annular plate (14-3), the upper through holes (14-4) penetrate through the upper surface and the lower surface of the upper outer annular plate (14-3), and an upper interception block (14-5) is arranged between the upper through holes (14-4);
the fixed valve plate (15) is an annular plate, the annular part is a lower outer annular plate (15-3), a plurality of lower through holes (15-4) are formed in the plate surface of the lower outer annular plate (15-3), the lower through holes (15-4) penetrate through the upper surface and the lower surface of the lower outer annular plate (15-3), and a lower intercepting block (14-5) is arranged between the lower through holes (15-4);
the diameter of the inner hole of the upper outer ring plate (14-3) is equal to that of the inner hole of the lower outer ring plate (15-3), the number of the upper intercepting blocks (14-5) is equal to that of the lower through holes (5-4), and the area of the lower end face of the upper intercepting block (14-5) is larger than that of the upper end face of the lower through hole (15-4); the number of the lower intercepting blocks (14-5) is equal to that of the upper through holes (14-4), and the area of the upper end face of the lower intercepting block (14-5) is larger than that of the lower end face of the upper through hole (14-4);
the double-flow-passage sleeve (16) comprises an inner sleeve (16-1) and an outer sleeve (16-2) which are coaxial, the inner sleeve (16-1) is sleeved in the outer sleeve (16-2), the diameter of the inner sleeve (16-1) is equal to the diameter of the lower outer annular plate (15-3), and a fluid outlet (21) is arranged below the double-flow-passage sleeve (16);
the center of the upper outer ring plate (14-3) is provided with a center ring (14-1), the center ring (14-1) is connected with the transmission shaft (12), and the center ring (14-1) is connected with the upper outer ring plate (14-3) through a plurality of upper connecting plates (14-2);
the area of the upper end surface of the upper through hole (14-4) is larger than that of the lower end surface.
2. A device for regulating the local flow rate of a pipeline according to claim 1, characterized in that the center of the lower outer ring plate (15-3) is provided with a support shaft (15-1), the support shaft (15-1) is provided at the lower side of the center ring (14-1), and the support shaft (15-1) is connected with the lower outer ring plate (15-3) through a lower connecting plate (15-2).
3. A device for regulating the local flow rate of a pipeline according to claim 1, characterized in that the upper outer ring plate (15-3) is fitted in a bearing (13), the outer side wall of the bearing (13) being connected to the inner side wall of the valve body (10).
4. A device for regulating the local flow rate of a conduit according to claim 1, characterized in that the inner sleeve (16-1) and the outer sleeve (16-2) are connected by means of a bottom connecting plate (16-3).
5. A device for regulating the local flow rate of a pipeline according to claim 1, characterized in that the upper end of the valve body (10) is connected with an inlet end valve cover (7), and the valve stem (1) passes through the center of the inlet end valve cover (7).
6. A device for regulating the local flow rate of a pipeline according to claim 5, characterized in that a packing (6) is arranged at the position where the valve rod (1) is inserted into the valve cover (7) at the inlet end, a packing pressing sleeve (5) is arranged at the upper side of the packing (6), and a packing pressing plate (4) is arranged at the upper side of the packing pressing sleeve (5).
7. A device for regulating the local flow rate of a conduit according to any one of claims 1 to 6, characterized in that the inner end of the fluid inlet (20) is provided with a sleeve (11), the inner end of the sleeve (11) being in contact with the drive shaft (12).
8. A method of adjusting a device for local flow rate of a pipe according to claim 1, characterized in that the flow rate of the fluid is controlled by rotating an adjustable valve plate (14) to adjust the overlap between the upper through-flow opening (14-4) and the lower through-flow opening (15-4); specifically, fluid flows from the fluid inlet (20) into the valve body (10);
when the upper through-flow opening (14-4) and the lower through-flow opening (15-4) are communicated, fluid firstly passes through the inner ring of the upper outer ring plate (14-3) and the upper through-flow opening (14-4), then passes through the inner ring of the lower outer ring plate (15-3) and the lower through-flow opening (15-4), and then flows out of the fluid outlet (21) through the inner sleeve (16-1) and the outer sleeve (16-2);
when the upper through-flow opening (14-4) and the lower through-flow opening (15-4) are isolated, fluid flows through the inner ring of the upper outer ring plate (14-3), the inner ring of the lower outer ring plate (15-3) and the inner sleeve (16-1) in sequence, and flows out of the fluid outlet (21).
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| RU2073152C1 (en) * | 1993-12-07 | 1997-02-10 | Общество с ограниченной ответственностью "Техарм" | Stop-control straight flow valve and method of its assembling |
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