CN202725649U - Water cooling unit of water cooling device - Google Patents
Water cooling unit of water cooling device Download PDFInfo
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- CN202725649U CN202725649U CN2012203787405U CN201220378740U CN202725649U CN 202725649 U CN202725649 U CN 202725649U CN 2012203787405 U CN2012203787405 U CN 2012203787405U CN 201220378740 U CN201220378740 U CN 201220378740U CN 202725649 U CN202725649 U CN 202725649U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 238000001816 cooling Methods 0.000 title claims abstract description 164
- 238000002347 injection Methods 0.000 claims description 58
- 239000007924 injection Substances 0.000 claims description 58
- 230000008602 contraction Effects 0.000 claims description 42
- 238000005507 spraying Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 47
- 239000002344 surface layer Substances 0.000 abstract description 8
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000000498 cooling water Substances 0.000 description 40
- 239000012530 fluid Substances 0.000 description 19
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- 239000010959 steel Substances 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 4
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The utility model provides a water cooling unit of a water cooling device. The water cooling unit comprises an inlet guide pipe, a water cooling spray nozzle, a turbulent flow pipe and an outlet positioning guide pipe, wherein the water cooling spray nozzle comprises a pipe body with a water inlet on the side wall, and a spray nozzle body provided with an axially communicated inner cavity and arranged in the pipe body; a water collection cavity is formed between the spray nozzle body and the pipe body; a first spray channel converged to the axis of the spray nozzle body is circumferentially arranged on the spray nozzle body; a first spray angle is formed between the first spray channel and the axis of the spray nozzle body; a second spray channel converged to the axis of the spray nozzle body is circumferentially arranged on the spray nozzle body; a second spray angle is formed between the second spray channel and the axis of the spray nozzle body; the first spray channel and the second spray channel have the same converging direction; and the first spray angle is smaller than the second spray angle. An abnormal structure is not formed on a surface layer of a rolled piece subjected to water cooling treatment by the water cooling unit of the water cooling device, and the outward emission speed of heat in the center and the temperature reduction speed of the surface layer are reasonably controlled to improve the comprehensive performance of the rolled piece.
Description
Technical Field
The utility model relates to a water cooling unit of water cooling plant is applicable to stick, wire rod water cooling plant in advance and wears among the water cooling plant.
Background
The water cooling device is a device for forced cooling and on-line heat treatment of rolled high-temperature rods and wires, and the principle is that the rods and wires are rapidly cooled in an austenite state after being hot-rolled, the surfaces of the rods and wires are quenched into martensite, and then the surfaces of the rods and wires are self-tempered by the waste heat discharged from the centers of the rods and wires, so that the strength and the plasticity of the rods and wires are improved, the toughness is improved, and good comprehensive mechanical properties are obtained.
The water cooling unit is a core part of the water cooling device, and key elements of the water cooling unit are a water cooling nozzle and a turbulent flow pipe. At present, a water cooling unit mainly adopted in a domestic bar workshop has unreasonable structural design of a water cooling nozzle and a turbulent flow pipe, the cooling speed of a rolled piece is higher than the critical speed of a surface layer reaching a certain depth of quenched martensite, the surface temperature of a steel bar is lower than the martensite start transformation point (Ms), and the austenite phase transformation to the martensite phase occurs.
Therefore, aiming at the problems that the temperature of the surface layer of the steel bar is fast to drop, the core cooling effect is poor and the like caused by the water cooling unit adopted in the bar workshop at present, particularly in the process of producing the steel bar, the water cooling unit with a novel structure needs to be designed, the core cooling meets the process requirements, and the temperature of the surface layer of the steel bar cannot be too low.
SUMMERY OF THE UTILITY MODEL
In order to solve the reinforcing bar surface temperature drop of present rod workshop water cooling plant's water cooling unit production fast, the poor scheduling problem of core cooling effect, the utility model provides a rod water cooling plant's water cooling unit, its simple structure can be when carrying out the water-cooling to the rod rolled piece, and the temperature drop of effectual control rolled piece top layer and core temperature obtains the cooling curve of reasonable superficial layer and core, improves rod comprehensive properties.
The utility model provides a technical scheme does: a water cooling unit of a water cooling device comprises an inlet guide pipe, a water cooling nozzle, a turbulent pipe and an outlet positioning guide pipe which are connected in sequence, wherein the water cooling nozzle comprises:
the side wall of the pipe body is provided with a water inlet;
the nozzle body is provided with an inner cavity which is axially communicated, is arranged in the pipe body, and forms a water collecting cavity communicated with the water inlet with the pipe body;
a first injection channel which converges towards the axis of the nozzle body is arranged on the nozzle body along the circumferential direction, and a first injection angle is formed between the first injection channel and the axis of the nozzle body;
the nozzle body is also provided with a second injection channel which converges towards the axis of the nozzle body along the circumferential direction of the nozzle body, and a second injection angle is formed between the second injection channel and the axis of the nozzle body;
the first injection channel and the second injection channel have the same convergence direction, and the first injection angle is smaller than the second injection angle.
Further, the nozzle body includes:
the inner cone sleeve is provided with a first conical surface converging towards the axis of the inner cone sleeve, a plurality of straight diversion trenches extending along the plain line direction of the first conical surface are uniformly distributed on the first conical surface along the circumferential direction, the water inlet end of each straight diversion trench is communicated with the water collecting cavity, and the water outlet end of each straight diversion trench is communicated with the inner cavity of the inner cone sleeve;
and the outer taper sleeve is provided with a second taper surface matched with the first taper surface, and the second taper surface is matched with the plurality of straight diversion trenches on the first taper surface of the inner taper sleeve to form the first injection channel which converges towards the axis of the inner taper sleeve along the plain line direction of the first taper surface.
Furthermore, a plurality of straight-line holes are uniformly distributed along the circumferential direction of the outer taper sleeve, the water inlet end of each straight-line hole is communicated with the water collecting cavity, the water outlet end of each straight-line hole is communicated with the inner cavity of the outer taper sleeve, and the water inlet ends of the straight-line holes gradually converge to the water outlet ends of the straight-line holes to form the second injection channel which converges to the axis of the outer taper sleeve.
Furthermore, the plurality of straight guide grooves and the plurality of straight holes are staggered in space, and the water outlet ends of the plurality of straight guide grooves and the water outlet ends of the plurality of straight holes are intersected on the inner cavity wall of the nozzle body.
Furthermore, an adjusting gasket for adjusting the flow of the first spraying channel is arranged between the inner taper sleeve and the outer taper sleeve.
Further, the turbulent tube includes:
a cooling conduit; and the number of the first and second groups,
the multiple sections of turbulence sleeves are sequentially connected in series in the cooling guide pipe; wherein,
each turbulence sleeve is provided with a through hole which is communicated along the axial direction, one end of the through hole is a conical contraction opening, the other end of the through hole is a conical expansion opening, a throat part is formed between the conical contraction opening and the conical expansion opening, the throat part is an equal-diameter throat pipe which extends along the axial direction of the turbulence sleeve, the inner wall of the equal-diameter throat pipe is provided with at least one group of pressure relief holes, and each group of pressure relief holes comprises a plurality of through holes which are radially distributed along the circumferential direction of the equal-diameter throat pipe;
the through holes of the multi-section turbulence sleeves are sequentially communicated to form a rolled piece channel which is communicated with the inner cavity of the water-cooling nozzle and has a periodically-changed section.
Furthermore, a plurality of groups of pressure relief holes are formed in the inner wall of the equal-diameter throat pipe, and the plurality of groups of pressure relief holes are distributed along the axial direction of the equal-diameter throat pipe.
Further, the contraction angle of the conical contraction opening of the turbulence sleeve is 20-23 degrees, the expansion angle of the conical expansion opening of the turbulence sleeve is 20-23 degrees, and the contraction angle of the conical contraction opening of the turbulence sleeve is the same as the expansion angle of the conical expansion opening of the turbulence sleeve.
Furthermore, two ends of each turbulence sleeve are fixedly connected with a positioning flange used for carrying out radial positioning and axial positioning when a plurality of sections of the turbulence sleeves are connected in series respectively;
the positioning flange is of a disc type structure, a plurality of positioning pin holes are formed in the end face of the positioning flange along the circumferential direction, and a plurality of grooves which are communicated along the axial direction of the positioning flange are formed in the peripheral face of the positioning flange.
Furthermore, the inlet conduit is provided with an inner cavity which is axially communicated, one end of the inner cavity of the inlet conduit is a conical contraction port, and the other end of the inner cavity of the inlet conduit is a conical expansion port.
The utility model has the advantages that:
the utility model discloses water cooling unit simple structure of water cooling plant, when carrying out water-cooling treatment to the rolled piece, the rolled piece top layer can not produce the subcooling, so anomalous organization such as martensite can not appear on the rolled piece top layer, widmansonite, the outside speed and the top layer temperature drop speed that scatters and disappears of the core heat of rolled piece can obtain reasonable control, make the cooling rate of rolled piece between slow cooling and quick cooling, process the utility model discloses its outer temperature of water cooling unit control refrigerated rolled piece of water cooling plant is lower to restrain the crystalline grain and grows up, and the inlayer temperature is reasonable to the speed of outer diffusion, the corresponding cooling of having accelerated the inlayer, and the crystalline grain inlayer also obtains restraining, and the ectonexine crystalline grain all obtains restraining, improves comprehensive properties such as the yield strength of rolled piece, recurvation, welding performance.
Drawings
Fig. 1 is a schematic structural view of a water cooling unit of a water cooling apparatus according to the present invention;
fig. 2 is a schematic external view of a water cooling unit of the water cooling apparatus according to the present invention;
FIG. 3 is a schematic view of a water-cooled nozzle;
FIG. 4 is a schematic view of the structure of FIG. 3 along line A-A;
FIG. 5 shows a schematic structural view of a turbulator;
FIG. 6 shows a schematic view of the structure of the turbulator sleeve;
FIG. 7 is a schematic view of the structure of FIG. 6 along the direction B-B.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the utility model provides a water cooling unit of water cooling device, it includes inlet pipe 1, water-cooling nozzle 2, turbulent flow pipe 3 and export positioning pipe 4 that connect gradually, wherein, as shown in fig. 3, water-cooling nozzle 2 includes:
a water inlet 211 is arranged on the side wall of the axially through pipe body 21; and the number of the first and second groups,
the nozzle body 22 is provided with an inner cavity 220 which is through along the axial direction, is arranged in the tube body 21 and forms a water collecting cavity 23 which is communicated with the water inlet 211 with the tube body 21;
the nozzle body 22 is circumferentially provided with a first injection channel 22a, a water inlet end of the first injection channel 22a is communicated with the water collecting cavity 23, a water outlet end of the first injection channel 22a is communicated with the inner cavity 220 of the nozzle body 22, the first injection channel 22a gradually converges towards the axis of the nozzle body 22 from the water inlet end to the water outlet end, and a first injection angle (the first injection angle is α in fig. 3) is formed between the first injection channel 22a and the axis of the nozzle body 22;
the nozzle body 22 is further provided with a second injection channel 22b along the circumferential direction, a water inlet end of the second injection channel 22b is communicated with the water collecting cavity 23, a water outlet end of the second injection channel 22b is communicated with the inner cavity 220 of the nozzle body 22, the second injection channel 22b gradually converges towards the axis of the nozzle body 22 from the water inlet end to the water outlet end, and a second injection angle (the second injection angle is β in fig. 3) is formed between the second injection channel 22b and the axis of the nozzle body 22;
the convergence directions of the first injection channel 22a and the second injection channel 22b are approximately the same, so that the horizontal direction of the jet flow sprayed by the first injection channel 22a and the horizontal direction of the jet flow sprayed by the second injection channel 22b are the same as the traveling direction of the rolled piece; and the first spray angle alpha is smaller than the second spray angle beta so that the spray from the first spray channel 22a and the spray from the second spray channel 22b may intersect.
The utility model discloses when the water cooling unit of water cooling plant is cooling the rolled piece, the rolled piece passes entry pipe 1, water cooling nozzle 2, turbulent flow pipe 3 and export positioning conduit 4 in proper order, cooling water gets into in water collecting cavity 23 from water cooling nozzle 2's water inlet 211, and is full of in water collecting cavity 23 back along first jet passage 22a and the high-speed blowout of second jet passage 22b intersection, wherein, first jet passage 22a jets out little jet angle bunch, can form high-speed fluid on the rolled piece surface, the impact force of fluid is big, be favorable to destroying the steam film on rolled piece surface; the second injection channel 22b injects a large injection angle jet beam, so that the film breaking length on the rolled piece can be prolonged, the steam film damage area is increased, and the heat exchange efficiency is improved, so that the water cooling strength of the rolled piece is reasonably controlled, and the cooling is uniform; the water-cooling nozzle 2 adopts two spraying channels, so that the cooling water flow is increased, when a rolled piece is cooled, a cooling process with high flow and low water cooling can be realized, the cooling effect is good, the flow of cooling water can be controlled, the cooling speed of the rolled piece can be controlled, the surface layer of the rolled piece can not be supercooled, abnormal structures such as martensite and weishi can not appear on the surface layer of the rolled piece, and the speed of outward dissipation of the core heat of the rolled piece and the surface layer temperature drop speed can be reasonably controlled.
In addition, in the process of carrying out water cooling treatment on the rolling mill, the larger vertical component of the large spray angle jet beam of the second spray channel 22b of the water cooling nozzle 2 can be blocked and consumed by the small spray angle jet beam of the first spray channel 22a, the traditional mode that the water cooling nozzle 2 sprays at a single spray angle to form columnar spray is changed, the interaction of the two spray angle jet beams weakens the kinetic energy of the cooling water jet, uniform jet flow is formed, the impact of strong water flow on a rolled piece is reduced, the movement of the rolled piece in a water cooling device is avoided, and therefore the adverse change of the internal structure of the rolled piece is avoided.
In addition, in prior art, after the rolled piece breaks away from the rolling mill and gets into the water cooling unit, because frictional resistance, reduce the power that advances gradually, the utility model discloses the water cooling nozzle 2 of water cooling unit sprays according to the hydrodynamics angle, can produce to the rolling mill and hold in the palm the effort of floating and advancing.
A preferred embodiment assembly of the nozzle body 22 is provided below. As shown in fig. 2 and 3, the nozzle body 22 includes:
the inner cone sleeve 221 is provided with a first conical surface converging towards the axis of the inner cone sleeve 221, the included angle between the plain line of the first conical surface and the axis of the inner cone sleeve 221 is alpha, a plurality of straight diversion grooves 221a extending along the plain line direction of the first conical surface are uniformly distributed on the first conical surface along the circumferential direction, the water inlet end of each straight diversion groove 221a is communicated with the water collecting cavity 23, and the water outlet end is communicated with the inner cavity of the inner cone sleeve 221; and the number of the first and second groups,
an outer taper sleeve 222 having a second taper surface which is engaged with the first taper surface and which is engaged with the plurality of straight guide grooves 221a of the first taper surface to form a first injection passage 22a which converges toward the axis of the inner taper sleeve 221 along the direction of the prime line of the first taper surface;
a plurality of straight-line holes 222a are uniformly distributed on the outer taper sleeve 222 along the circumferential direction, the water inlet end of each straight-line hole 222a is communicated with the water collecting cavity 23, the water outlet end of each straight-line hole 222a is communicated with the inner cavity of the outer taper sleeve 222, the water inlet ends of the straight-line holes 222a gradually converge to the water outlet ends of the straight-line holes 222a to form a second injection channel 22b converging towards the axis of the outer taper sleeve 222, and an included angle beta is formed between the central line of each straight-line hole 222a and the axial line of the outer taper sleeve 222.
Fig. 4 is a schematic cross-sectional structure of first injection passage 22a and second injection passage 22 b. As shown in fig. 4, the plurality of straight grooves of the first spray passage 22a are uniformly distributed along the circumferential direction of the inner taper sleeve 221, and the plurality of straight holes 222a of the second spray passage 22b are uniformly distributed along the circumferential direction of the outer taper sleeve 222, and since the second spray angle of the second spray passage 22b is greater than the first spray angle of the first spray passage 22a, the plurality of straight holes 222a constituting the second spray passage 22b are located at the periphery of the plurality of straight guide grooves 221a constituting the first spray passage 22 a. As shown in fig. 3, in the present embodiment, preferably, the plurality of straight guide grooves 221a and the plurality of straight holes 222a are arranged in a spatially staggered manner.
In addition, it should be noted that, the number of the straight guide grooves 221a and the straight rows of holes 222a shown in fig. 4 is 6, and the 6 straight guide grooves 221a and the 6 straight rows of holes 222a are arranged in a staggered manner, in practical application, the number and the hole diameter of the straight guide grooves 221a and the straight rows of holes 222a can be determined according to the process requirements. In this embodiment, it is preferable that the water outlet ends of the plurality of straight guiding grooves 221a intersect with the water outlet ends of the plurality of straight holes 222a, and the intersection is located on the inner cavity wall of the nozzle body 22, so that the interaction effect between the jets sprayed from the first spraying channel 22a and the second spraying channel 22b is the best. Of course, in practical applications, the water outlet ends of the straight guiding grooves 221a and the water outlet ends of the straight holes 222a may also be designed not to intersect with each other, on the premise of ensuring that the jet streams sprayed from the first spraying channel 22a and the second spraying channel 22b intersect with each other.
In this embodiment, preferably, an adjusting gasket for adjusting the fit clearance between the inner taper sleeve 221 and the outer taper sleeve 222 may be further disposed between the inner taper sleeve 221 and the outer taper sleeve 222, and the flow rate of the cooling water of the first injection passage 22a may be adjusted by the adjusting gasket.
In the nozzle body 22 with the above structure, since the first injection passage 22a is formed by matching the first conical surface and the second conical surface, the flow rate of the first injection passage 22a can be adjusted by adjusting the matching gap between the first conical surface and the second conical surface, so as to control the flow rate of the cooling water; in addition, the first injection channel 22a is formed by matching a plurality of straight flow grooves with the second conical surface, that is, the first injection channel 22a adopts a hole jet flow mode, the second injection channel 22b adopts a plurality of straight discharge holes 222a, and also adopts the hole jet flow mode, so that the straight flow grooves and the straight discharge holes 222a are not easily blocked by impurities in the cooling water, the influence of the high-flow-rate cooling water on the erosion of the straight flow grooves and the straight discharge holes 222a is small, and the flow of the cooling water is further ensured.
Of course, in practical applications, the nozzle body 22 may also take other structural forms, such as: the nozzle body 22 does not adopt the structural form that the inner taper sleeve 221 is matched with the outer taper sleeve 222, but is designed into an integral structure, and a first spray channel 22a and a second spray channel 22b which are converged are arranged on the nozzle body 22 of the integral structure, and the first spray angle is smaller than the second spray angle; alternatively, the nozzle body 222 is still fitted with the inner taper sleeve 221 and the outer taper sleeve 222, and the first injection passage 22a is formed by an annular gap formed by the inner taper sleeve 221 and the outer taper sleeve 222; alternatively, the nozzle body 22 is still provided with the inner taper sleeve 221 and the outer taper sleeve 222, and the plurality of straight guide grooves 221a forming the first injection passage 22a are provided on the second taper surface of the outer taper sleeve 222, etc., which are not listed here.
In addition, among the prior art, the turbulence cover that the turbulence pipe 3 of water-cooling unit adopted usually leads to the cooling water turbulent degree too high, the water pressure fluctuation is big easily because its throat is extremely short structurally, and the heat transfer coefficient is big, the cooling intensity is high, the problem that temperature gradient is big, for further improvement rolled piece water-cooling effect, the utility model discloses water-cooling unit of water cooling plant has also improved its turbulence pipe 3 structure.
As shown in fig. 5 to 7, the turbulent flow tube 3 of the water cooling unit of the present invention includes:
a cooling duct 31; and the number of the first and second groups,
a plurality of sections of turbulence sleeves 32 which are sequentially connected in series in the cooling guide pipe 31; wherein,
each turbulence sleeve 32 is provided with a through hole which is axially penetrated and used for cooling water to pass through, one end of the through hole is a conical contraction port 321, the other end of the through hole is a conical expansion port 322, and a throat part is formed between the conical contraction port 321 and the conical expansion port 322;
the utility model discloses turbulent flow cover 32 that adopts in the water-cooling unit improves the part and just lies in, has lengthened the length of throat, is one along this turbulent flow cover 32 axial extension and have the constant diameter choke 323 of certain length with the throat design, is equipped with multiunit pressure release hole 324 on the inner wall of constant diameter choke 323, and every group pressure release hole 324 includes along constant diameter choke 323 circumference setting, be a plurality of through-holes of radial distribution.
In the water cooling unit of the water cooling device of the utility model, the conical contraction port 321, the equal-diameter throat 323 and the conical expansion port 322 of the turbulent flow sleeve 32 enable a plurality of sections of the turbulent flow sleeve 32 to be connected in series in the cooling conduit 31 to form the turbulent flow pipe 3 with the inner diameter changing periodically, the change of the inner diameter of the turbulent flow pipe 3 promotes the exchange of kinetic energy and heat between cooling water, through the improvement of the throat between the conical contraction port 321 and the conical expansion port 322 of the turbulent flow sleeve 32, the length of the throat is lengthened to form the equal-diameter throat 323 with a certain length along the axial extension of the turbulent flow sleeve 32, the guiding effect is increased, and the pressure relief hole 324 is structurally added, the pressure relief capacity is realized, the formation of positive pressure is reduced, the resistance of a rolled piece when the rolled piece passes through water cooling at high speed, meanwhile, the equal-diameter throat 323 with a certain length is formed by lengthening the throat, after the cooling water fluid enters the equal-diameter throat 323 from the conical contraction port, the micro-steady-state flow can be carried out in the equal-diameter throat 323, so that the water pressure fluctuation is reduced, and the impact of cooling water on a rolled piece is reduced; the heat exchange coefficient and the cooling intensity can be effectively controlled, the temperature gradient distribution along the section direction is small, and the cooling temperature is easy to control, so that the cooling process with light water penetration, low supercooling and small temperature difference can be realized.
In this embodiment, the length of the constant diameter throat 323 is preferably: when the diameter of the rolled piece is 10-20 mm, the length of the equal-diameter throat 323 is 60-100 mm. Of course, in practical applications, the length of the throat 323 with equal diameter can be adjusted reasonably according to the specification and the process requirements of the rolled piece, and is not illustrated here.
The diameter of the grade throat is the key to control the heat exchange coefficient and the cooling strength. If the diameter of the equal-diameter throat 323 is too large, the cooling water flow is large, the cooling is uneven, and the rolled piece can generate wave bending; and if the diameter of the equal-diameter throat 323 is too small, the rolled piece and the pipe wall are easy to rub to generate resistance on the rolling mill. In the embodiment, preferably, when the diameter of the rolled piece is 10mm, the diameter of the equal-diameter throat 323 is preferably 20mm, so that the required positive pressure value is met, and friction between the rolled piece and the pipe wall is avoided; when the diameter of the rolled piece is 12-16 mm, the diameter of the equal-diameter throat 323 is preferably 30 mm; when the diameter of the rolled piece is 18-22 mm, the diameter of the equal-diameter throat 323 is preferably 35 mm; when the diameter of the rolled piece is 25-36, the diameter of the equal-diameter throat 323 is preferably 60 mm. Of course, in practical application, the straight throat 323 with the same diameter is reasonably adjusted according to the specification and the size of the rolled piece and the process requirements, and is not listed here.
In this embodiment, preferably, as shown in fig. 5 and 6, the plurality of sets of pressure relief holes 324 are arranged along the axial direction of the throat 323 with the same diameter. The utility model discloses the turbulent flow cover 32 of water-cooling unit sets up multiunit pressure release hole 324 on the inner wall of constant diameter throat 323, the rolled piece is during constant diameter throat 323, cooling water accessible pressure release hole 324 flows constant diameter throat 323, the pressure oscillation of cooling water has been reduced, the resistance of rolled piece when passing the water-cooling at a high speed has been reduced, and the length of extension constant diameter throat 323, pressure release hole 324 on the constant diameter throat 323 can obtain big reynolds number, adjust laminar flow and the turbulent state of cooling water pressure and fluid, positive pressure district plays the pressure release effect in the constant diameter throat 323, further guarantee that the heat transfer is even.
It is understood that, in practical application, only one set of pressure relief holes 324 may be provided on the inner wall of the throat 323 with the same diameter, and the number and size of the through holes in each set of pressure relief holes 324 may be adjusted according to practical requirements.
The size of the contraction angle gamma of the conical contraction mouth 321 of the turbulence sleeve 32 directly affects the size of the turbulence in the turbulence pipe 3, and thus the cooling intensity. The contraction angle gamma of the conical contraction port 321 of the turbulence sleeve 32 is small, and the velocity distribution of cooling water is uniform; the conical contraction port 321 of the turbulence sleeve 32 has a large contraction angle gamma, so that the fluid velocity distribution is uneven, but the turbulence degree is increased, and the heat exchange intensity is high. The size of the cooling zone depends on the expansion angle of the conical expansion port 322 of the turbulent flow sleeve 32, and if the expansion angle δ of the conical expansion port 322 of the turbulent flow sleeve 32 is large, the shorter the uniform zone is, the lower the axial flow rate of the cooling water of the conical expansion port 322 of the turbulent flow sleeve 32 is; the smaller the expansion angle δ of the tapered expansion port 322, the longer the uniform zone, and the higher the axial flow rate of the cooling water at the tapered expansion port 322 of the turbulent sleeve 32. Thus, the taper angle γ of the taper-shaped contraction 321 of the turbulent flow sleeve 32 is suitable for achieving uniform fluid velocity and a certain turbulence level, and the taper angle δ of the expansion 322 of the turbulent flow sleeve 32 is suitable for ensuring a reasonable cooling area and obtaining a desired axial flow velocity.
In this embodiment, preferably, the contraction angle γ of the tapered contraction port 321 of the turbulence sleeve 32 and the expansion angle δ of the tapered expansion port 322 of the turbulence sleeve 32 are both 20 ° -23 °. When the contraction angle gamma of the conical contraction port 321 of the turbulent flow sleeve 32 and the expansion angle delta of the conical expansion port 322 of the turbulent flow sleeve 32 are both 20-23 degrees, the turbulent flow generated by water flow is moderate, the flow rate is uniform under the condition of the same total water quantity, the cooling effect is better, and meanwhile, the resistance of cooling water to a rolled piece is small.
In addition, when the contraction angle γ of the tapered contraction port 321 of the turbulent flow sleeve 32 is equal to the expansion angle δ of the tapered expansion port 322, the turbulent flow sleeve 32 is symmetrical; when the contraction angle gamma of the conical contraction port 321 is not equal to the expansion angle delta of the conical expansion port 322, the asymmetric turbulence sleeve 32 is formed. In this embodiment, preferably, the turbulence sleeve 32 of the present invention is designed as a symmetrical structure, that is, the contraction angle γ of the tapered contraction opening 321 of the turbulence sleeve 32 is equal to the expansion angle δ of the tapered expansion opening 322 of the turbulence sleeve 32, and the design scheme of the turbulence sleeve 32 adopting this symmetrical structure can enhance the cooling uniformity of the rolled piece.
In addition, in this embodiment, as shown in fig. 5 and fig. 6, it is preferable that the two ends of the turbulence sleeve 32 are respectively connected to a positioning flange 320, the positioning flange 320 is a disc structure, and a positioning pin hole 150 is circumferentially disposed on an end surface of the positioning flange. When the multiple stages of turbulence sleeves 32 are assembled in the cooling water pipe in series, the outer circle of the positioning flange 320 contacts with the inner wall of the cooling guide pipe 31 to radially position the turbulence sleeve 32, and the positioning pin holes 150 on each stage of turbulence sleeve 32 are correspondingly connected with the positioning pin holes on the adjacent turbulence sleeve 32 to axially position the multiple stages of turbulence sleeves 32.
In the present embodiment, it is preferable that a plurality of grooves 3202 penetrating in the axial direction of the positioning flange are further formed on the outer peripheral surface of the positioning flange 320, and when the multi-stage turbulence sleeve 32 is connected in series to form the turbulence pipe 3, the plurality of grooves and the inner wall of the cooling duct 31, and the outer wall of the multi-stage turbulence sleeve 32 and the inner wall of the cooling duct can penetrate each other, thereby adjusting the cooling water in the turbulence sleeve 32.
As shown in FIG. 7, a plurality of groups of pressure relief holes 3201 are uniformly distributed on the throat part along the circumferential direction, the water inlet end of each pressure relief hole 3201 is communicated with the inner cavity of the throat pipe 323, and the water outlet end is communicated with the inner cavity of the cooling conduit 31, so that the water pressure at the throat part of the inner cavity of the turbulent flow sleeve 32 can be effectively adjusted.
As shown in fig. 1, when the turbulence pipe 3 of the water cooling unit of the present invention is used for water cooling treatment of a rolled piece, the inlet end of the turbulence pipe is fixedly connected with the water cooling nozzle 2, and a first sealing gasket is arranged between the first flange of the cooling conduit 31 and the flange of the water cooling nozzle 2; the outlet end of the cooling duct 31 may be fixedly connected to the outlet positioning duct 4 by means of a second flange, and a second gasket is arranged between the second flange of the cooling duct 31 and the flange of the outlet positioning duct 4.
As shown in fig. 5, when the turbulence pipe 3 of the water cooling unit of the present invention is used for water cooling of a rolled piece, the cooling water fluid enters the conical contraction port 321 of one section of the turbulence sleeve 32, and enters the equal-diameter throat 323 through the conical contraction port 321 of the turbulence sleeve 32, because the inner diameter of the equal-diameter throat 323 is the minimum, the fluid velocity is the maximum at this position, and the pressure is the minimum; when the fluid enters the conical expansion port 322 of the turbulence sleeve 32, the fluid is gradually diffused, the speed is reduced, and the pressure is gradually increased; then enters the conical contraction port 321 of the next section of the turbulence sleeve 32, and because the contraction wall blocks, a part of fluid is impacted and flows back, so that a vortex is formed between the two sections of the turbulence sleeve 32, and the existence of the vortex increases the turbulence degree of the fluid, thereby being beneficial to heat exchange.
The utility model discloses a turbulent sleeve 32 that turbulent flow pipe 3 adopted forms one along its axial extension constant diameter throat 323 that has certain length because throat extension, and the cooling water can do the low turbulence state and flow in constant diameter throat 323, and when meetting pressure release hole 324 on the constant diameter throat 323 inner wall, fluidic section changes and can produce local turbulence, and fluid can flow with higher speed, and when fluid reentrant toper expansion mouth 322, can be changed into strong turbulence by laminar flow and low turbulence state. When fluid flows through a series of turbulent flow sleeves 32 at high speed along the axial direction of the bar, the pressure is periodically changed due to the periodic change of the inner diameter, cooling water is vigorously stirred on the surface of the bar due to the impact of fluctuating pressure, steam film damage and bubble separation on the surface of a rolled piece are facilitated, and due to the combination of movement of two states of water flow, the fluid is ensured to have larger cooling kinetic energy, a proper heat exchange coefficient is ensured, the cooling strength is controlled, meanwhile, the cooling uniformity is ensured, the movement direction of the rolled piece is the same as the movement direction of the fluid, and the fluid in the constant-diameter throat 323 is in laminar flow movement, so that the cooling water is in comprehensive contact with the rolled piece, and the utilization rate of the cooling water is improved.
Therefore, the utility model discloses the turbulent flow pipe 3 of water-cooling unit is through adopting the turbulent flow cover 32 of lengthening the throat for constant diameter choke 323, the length in positive pressure district has been lengthened, can alleviate the resistance of rolled piece when passing the water-cooling at a high speed, and simultaneously, the throat extension of turbulent flow cover 32 forms the constant diameter choke 323 that has certain length, set up pressure release hole 324 on the constant diameter choke 323 inner wall, cooling water fluid is getting into the constant diameter choke 323 back from toper shrink mouth 321, can do laminar flow and weak turbulent flow state motion in the constant diameter choke 323, heat transfer coefficient and cooling intensity obtain effective control, the temperature gradient along the section direction distributes for a short time, easy control cooling temperature, thereby can realize light water passing, low supercooling, the cooling process of little difference in temperature. In addition, the taper contraction port 321 of the turbulence pipe 3 of the invention has a smaller contraction angle gamma, so that the uniform area is longer, which is beneficial to heat exchange.
The utility model discloses in the preferred embodiment, the rolled piece is when passing through the water cooling unit, and cooling water flows from water cooling nozzle 2 along first injection passage 22a and second injection passage 22b blowout, and the produced gas-liquid barrier of rolled piece surface film state boiling is directly bombarded to the cooling water stream strand, and the cooling water can adopt the muddy water that contains suspended particles such as ferric oxide, and its density is 5.7, so its kinetic energy is 5.7 times of water. The steam film can be effectively destroyed, the heat exchange strength of the cooling water and the rolled piece is improved, and the cooling water has a clamping and conveying effect on the rolled piece due to the fact that the speed of the cooling water is higher than the running speed of the rolled piece, and therefore the running resistance of the rolled piece in the water cooling device is reduced; the rolled piece is collected with cooling water at the junction of the water-cooling nozzle 2 and the turbulent flow pipe 3 and then enters the turbulent flow pipe 3, the cooling water keeps a turbulent flow state through the throat and pressure relief hole 324 structure lengthened on the turbulent flow pipe 3, meanwhile, the pressure of the cooling water is kept stable, the balance of heat exchange between the cooling water and the rolled piece is achieved, the rolled piece is uniformly cooled, and after the rolled piece is cooled, the rolled piece enters the outlet positioning guide pipe 4.
To sum up, when the rolled piece gets into the utility model discloses during the water cooling unit, cooling rate can be controlled, and the top layer of rolled piece can not produce the subcooling, therefore anomalous organization such as martensite, weishi body can not appear on the rolled piece top layer, because the outside speed and the reasonable control of top layer temperature drop speed that scatters and disappears of the core heat of rolled piece make the cooling of rolled piece between slow cooling and quick cooling, through the control cooling process of novel high-efficient water cooling unit, the lower suppression crystalline grain of outer temperature grows up. The diffusion speed of the inner layer temperature to the outer layer is reasonable, the cooling of the inner layer is correspondingly accelerated, the crystal grains of the inner layer are also inhibited, the crystal grains of the inner layer and the crystal grains of the outer layer are inhibited, and the structure performance of the steel bar is very good.
Furthermore, the utility model discloses a water cooling unit can set up behind the well rolling mill group in rod workshop, forms water cooling plant in advance, because it can effective control to the rolled piece cooling, consequently, before the rolled piece gets into the finishing mill group, the temperature gradient also can effectual control, is favorable to the cold technological realization of accuse rolling accuse.
Furthermore, the utility model discloses a water-cooling unit also can set up before the finished product frame, reaches the effect that deformation is strengthened and phase transition is strengthened, and the rolling temperature and the final rolling temperature of each pass of control rolling accuse cold requirement control, and then the austenite recrystallization degree and the grain size after the recrystallization between the control pass and after the final rolling, the final rolling temperature is low, and the austenitizing temperature is low, and low to recrystallization district once, can restrain the recrystallization, keep the state of austenite. The influence of deformation strengthening is kept after the rolled piece enters water, the strength of the steel bar is improved, certain dislocation density and substructures are kept from the structure, and the mechanical property of the cooled rolled piece is better controlled.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A water cooling unit of a water cooling device comprises an inlet guide pipe, a water cooling nozzle, a turbulent pipe and an outlet positioning guide pipe which are connected in sequence, wherein the water cooling nozzle comprises:
the side wall of the pipe body is provided with a water inlet;
the nozzle body is provided with an inner cavity which is axially communicated, is arranged in the pipe body, and forms a water collecting cavity communicated with the water inlet with the pipe body;
a first injection channel which converges towards the axis of the nozzle body is arranged on the nozzle body along the circumferential direction, and a first injection angle is formed between the first injection channel and the axis of the nozzle body; it is characterized in that the preparation method is characterized in that,
the nozzle body is also provided with a second injection channel which converges towards the axis of the nozzle body along the circumferential direction of the nozzle body, and a second injection angle is formed between the second injection channel and the axis of the nozzle body;
the first injection channel and the second injection channel have the same convergence direction, and the first injection angle is smaller than the second injection angle.
2. The water cooling unit of a water cooling apparatus as set forth in claim 1, wherein the nozzle body comprises:
the inner cone sleeve is provided with a first conical surface converging towards the axis of the inner cone sleeve, a plurality of straight diversion trenches extending along the plain line direction of the first conical surface are uniformly distributed on the first conical surface along the circumferential direction, the water inlet end of each straight diversion trench is communicated with the water collecting cavity, and the water outlet end of each straight diversion trench is communicated with the inner cavity of the inner cone sleeve;
and the outer taper sleeve is provided with a second taper surface matched with the first taper surface, and the second taper surface is matched with the plurality of straight diversion trenches on the first taper surface of the inner taper sleeve to form the first injection channel which converges towards the axis of the inner taper sleeve along the plain line direction of the first taper surface.
3. The water cooling unit of a water cooling apparatus according to claim 2, characterized in that: the outer taper sleeve is internally provided with a plurality of straight-line holes which are uniformly distributed along the circumferential direction of the outer taper sleeve, the water inlet end of each straight-line hole is communicated with the water collecting cavity, the water outlet end of each straight-line hole is communicated with the inner cavity of the outer taper sleeve, and the water inlet ends of the straight-line holes gradually converge to the water outlet ends of the straight-line holes to form a second injection channel which converges towards the axis of the outer taper sleeve.
4. The water cooling unit of a water cooling apparatus according to claim 3, wherein: the straight guide grooves and the straight holes are staggered in space, and the water outlet ends of the straight guide grooves and the water outlet ends of the straight holes are intersected on the wall of the inner cavity of the nozzle body.
5. The water cooling unit of a water cooling apparatus according to claim 2, characterized in that: and an adjusting gasket for adjusting the flow of the first spraying channel is arranged between the inner taper sleeve and the outer taper sleeve.
6. The water cooling unit of the water cooling apparatus as claimed in any one of claims 1 to 5, wherein the turbulent flow tube comprises:
a cooling conduit; and the number of the first and second groups,
the multiple sections of turbulence sleeves are sequentially connected in series in the cooling guide pipe; wherein,
each turbulence sleeve is provided with a through hole which is communicated along the axial direction, one end of the through hole is a conical contraction opening, the other end of the through hole is a conical expansion opening, a throat part is formed between the conical contraction opening and the conical expansion opening, the throat part is an equal-diameter throat pipe which extends along the axial direction of the turbulence sleeve, the inner wall of the equal-diameter throat pipe is provided with at least one group of pressure relief holes, and each group of pressure relief holes comprises a plurality of through holes which are radially distributed along the circumferential direction of the equal-diameter throat pipe;
the through holes of the multi-section turbulence sleeves are sequentially communicated to form a rolled piece channel which is communicated with the inner cavity of the water-cooling nozzle and has a periodically-changed section.
7. The water cooling unit of a water cooling apparatus according to claim 6, wherein:
the inner wall of the equal-diameter throat pipe is provided with a plurality of groups of pressure relief holes, and the plurality of groups of pressure relief holes are distributed along the axial direction of the equal-diameter throat pipe.
8. The water cooling unit of a water cooling apparatus according to claim 6, wherein: the contraction angle of the conical contraction opening of the turbulence sleeve is 20-23 degrees, the expansion angle of the conical expansion opening of the turbulence sleeve is 20-23 degrees, and the contraction angle of the conical contraction opening of the turbulence sleeve is the same as the expansion angle of the conical expansion opening of the turbulence sleeve.
9. The water cooling unit of a water cooling apparatus according to claim 8, wherein: two ends of each turbulence sleeve are fixedly connected with a positioning flange used for carrying out radial positioning and axial positioning when a plurality of sections of the turbulence sleeves are connected in series;
the positioning flange is of a disc type structure, a plurality of positioning pin holes are formed in the end face of the positioning flange along the circumferential direction, and a plurality of grooves which are communicated along the axial direction of the positioning flange are formed in the peripheral face of the positioning flange.
10. The water cooling unit of a water cooling apparatus according to claim 1, characterized in that: the inlet conduit is provided with an inner cavity which is axially communicated, one end of the inner cavity of the inlet conduit is a conical contraction port, and the other end of the inner cavity of the inlet conduit is a conical expansion port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203787405U CN202725649U (en) | 2012-08-01 | 2012-08-01 | Water cooling unit of water cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203787405U CN202725649U (en) | 2012-08-01 | 2012-08-01 | Water cooling unit of water cooling device |
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| Publication Number | Publication Date |
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| CN202725649U true CN202725649U (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012203787405U Expired - Lifetime CN202725649U (en) | 2012-08-01 | 2012-08-01 | Water cooling unit of water cooling device |
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| CN (1) | CN202725649U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105363809A (en) * | 2015-12-16 | 2016-03-02 | 重庆麦拓科技有限公司 | Passing water cooler |
| CN105382042A (en) * | 2015-12-16 | 2016-03-09 | 重庆麦拓科技有限公司 | Through water cooling tube |
| CN107214202A (en) * | 2017-07-31 | 2017-09-29 | 石横特钢集团有限公司 | A kind of angle steel cooling control device after rolling and technique |
| CN107716568A (en) * | 2017-11-21 | 2018-02-23 | 湖南天益高技术材料制造有限公司 | A kind of non-rotation type close-up formula controlled rolling passing water cooler |
| CN109174983A (en) * | 2018-09-25 | 2019-01-11 | 湖南华菱湘潭钢铁有限公司 | A kind of wire and rod controlled rolling and controlled cooling spiral-flow type cooler |
| CN109821586A (en) * | 2019-02-21 | 2019-05-31 | 贵州大学 | The fast-speed cooling bath of experiment is quickly cooled down after metal works |
| CN114074116A (en) * | 2020-08-13 | 2022-02-22 | 北京京诚瑞信长材工程技术有限公司 | Hot rolling reinforcing bar rod accuse rolling accuse cold production line |
| CN114641354A (en) * | 2019-10-17 | 2022-06-17 | 达涅利机械设备股份公司 | Distributor pipe for cooling a metal strip |
-
2012
- 2012-08-01 CN CN2012203787405U patent/CN202725649U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105363809A (en) * | 2015-12-16 | 2016-03-02 | 重庆麦拓科技有限公司 | Passing water cooler |
| CN105382042A (en) * | 2015-12-16 | 2016-03-09 | 重庆麦拓科技有限公司 | Through water cooling tube |
| CN107214202A (en) * | 2017-07-31 | 2017-09-29 | 石横特钢集团有限公司 | A kind of angle steel cooling control device after rolling and technique |
| CN107716568A (en) * | 2017-11-21 | 2018-02-23 | 湖南天益高技术材料制造有限公司 | A kind of non-rotation type close-up formula controlled rolling passing water cooler |
| CN109174983A (en) * | 2018-09-25 | 2019-01-11 | 湖南华菱湘潭钢铁有限公司 | A kind of wire and rod controlled rolling and controlled cooling spiral-flow type cooler |
| CN109821586A (en) * | 2019-02-21 | 2019-05-31 | 贵州大学 | The fast-speed cooling bath of experiment is quickly cooled down after metal works |
| CN114641354A (en) * | 2019-10-17 | 2022-06-17 | 达涅利机械设备股份公司 | Distributor pipe for cooling a metal strip |
| CN114641354B (en) * | 2019-10-17 | 2024-05-07 | 达涅利机械设备股份公司 | Distributor tube for cooling metal strips |
| CN114074116A (en) * | 2020-08-13 | 2022-02-22 | 北京京诚瑞信长材工程技术有限公司 | Hot rolling reinforcing bar rod accuse rolling accuse cold production line |
| CN114074116B (en) * | 2020-08-13 | 2024-03-19 | 北京京诚瑞信长材工程技术有限公司 | Rolling and cooling control production line for hot rolled steel bar |
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Granted publication date: 20130213 |