CN102155861B - Cleaning and descaling element in heat exchange tube - Google Patents
Cleaning and descaling element in heat exchange tube Download PDFInfo
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- CN102155861B CN102155861B CN 201110007108 CN201110007108A CN102155861B CN 102155861 B CN102155861 B CN 102155861B CN 201110007108 CN201110007108 CN 201110007108 CN 201110007108 A CN201110007108 A CN 201110007108A CN 102155861 B CN102155861 B CN 102155861B
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Abstract
The invention discloses a cleaning and descaling element in a heat exchange tube, which belongs to the technical field of on-line cleaning and descaling of heat exchange tubes. The cleaning and descaling element comprises a solid revolution body, a plurality of inclined fins, spiral fins, discontinuous circumferential fins or intersection fins and one or two guide elastic intersection plate tail wings, wherein the plurality of fins are uniformly and circumferentially arranged at the periphery of the solid revolution body, and the root parts of the fins are connected with the outer surface of the solid revolution body; a revolution enveloping surface on the tops of all the fins is a cylinder outer surface of which the two ends are radiused or chamfered; and the one or two guide elastic intersection plate tail wings are formed by a plurality of intersectional wing plates or wing plates and connecting cylinders, are positioned at one end or two ends of the solid revolution body in the axial direction and are connected with the end part of the solid revolution body. The element has the advantages of good cleaning and descaling effects, low blockage possibility of the heat exchange tube and high ball recovery rate.
Description
Technical field
The present invention relates to cleaning and descaling component in a kind of heat exchanger tube, belong to cleaning and descaling and augmentation of heat transfer field in the heat pipe.
Background technology
Shell-and-tube heat exchanger is used in a large number and widely at industrial circles such as electric power, chemical industry and oil, and the heat exchanger overwhelming majority that is in operation has contamination and scale formation, particularly adopts the condenser of water quench etc.Dirt causes heat transfer coefficient of heat exchanger to reduce, and energy consumption increases, even plugging occurs and cause equipment normally to move; Fouling also can form underdeposit corrosion, shortens the service life of equipment.Online glueballs cleaning technique is used comparatively general in plant condenser, but the glueballs that uses at present is the elastomer structure of many micropores softness, in use the hygrometric state diameter of glueballs and proportion are difficult to accurately controlled, also be easy to by mud, dirt and microorganism etc. accompanyingly, cause that the cleaning and descaling effect is not ideal enough, ball collecting rate is low, be easy to the problems such as plugging.
Patent documentation ZL200710098489.0 discloses a kind of member for online cleaning and removing scale of heat exchange tube (documents 1), it is characterized in that: have some runners that become spiral or inclination with the central rotation axis, described runner is to be separated by the projection of spiral or the inclination diameter of Spherical Volume with described spherical glueballs; The external diameter of described spherical glueballs is not more than 2% because of the change that submergence produces, and the density of spherical glueballs is not more than 5% because of the variation that submergence produces, and the fluid density error of the density of spherical glueballs and conveying is not more than 10%.The disclosed architectural feature of this patent documentation has partly overcome the problems referred to above, but also there is following deficiency: 1, for the glueballs with the spherical structure of spiral wing, the direction of motion of its minimal flow resistance is not the direction of designed rotation, test shows that it is generally horizontal translation at heat exchanger tube or rolling in heat exchanger tube, and the problem that stopping up may appear in the direction that departs from the rotation of this design or cleaning performance is poor.2, for the glueballs of elliposoidal structure, although can guarantee to move by the direction of setting, the horizontal problem that gets lodged in the heat exchanger tube inner termination appears especially easily in heat exchanger tube.
Patent documentation ZL2009102444504 discloses a kind of member for online cleaning and removing scale of heat exchange tube with directed empennage (documents 2), its principal character is: contain a solid glueballs, a plurality of inclination wing, several baffle wings and a directed empennage, wherein: a plurality of inclination wings, circumferentially be evenly arranged in described solid glueballs surface, the maximum outline of inclination wing is spherical; Several baffle wings, be the sphere that 2 cruciform shape are arranged in described solid glueballs, and the junction also is the two ends of screw for circumferentially being evenly arranged the sphere junction of solid rubber revolution of basketball axle and the solid glueballs of a plurality of inclination wings, and the maximum outline of baffle wing is spherical; A directed empennage, be that a cylinder and a bead form, one end of cylinder connects bead and the other end connects described solid glueballs, and the junction of cylinder and described solid glueballs is for circumferentially being evenly arranged one of the solid rubber revolution of basketball axle of a plurality of inclination wings and sphere junction of solid glueballs, also be an end of screw, the cylinder of directed empennage also links to each other with the baffle wing that cruciform shape is arranged in this place.The disclosed architectural feature of this patent documentation has partly overcome aforementioned techniques and the existing problem of patent, but also there is following deficiency: when described a kind of member for online cleaning and removing scale of heat exchange tube with directed empennage is in obliquity in pipe, there is part inclination wing may not have the contact heat-exchanging inside pipe wall, and the heat exchanger tube inwall have the part heat exchange surface not cleaning and descaling component once by the time scraped by its inclination wing, and affect to a certain extent cleaning performance; By the directed empennage that cylinder and bead form, be inserted in easily in the mesh of ball screen and the slit and affect ball collecting rate.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide cleaning and descaling component in the high a kind of heat exchanger tube of cleaning and descaling better effects and if ball collecting rate.
Technical scheme of the present invention is:
This cleaning and descaling component contains: solid revolving body, a plurality of cylinder outline fin and one or two guiding elasticity cross board empennage, wherein:
Described solid revolving body is cylinder, drum shaped body, cone table, spheroid or spheroid, and two ends rounding or the chamfering of solid revolving body;
Described a plurality of cylinder outline fin circumferentially is evenly arranged in the periphery of described solid revolving body, and the root of described cylinder outline fin is connected with the face of cylinder of solid revolving body; The revolution enveloping surface of described a plurality of cylinder outline fin top is the cylinder outer surface of a two ends rounding or chamfering;
Described guiding elasticity cross board empennage is positioned at the axial end of described solid revolving body or two ends and is connected with the end of solid revolving body, described guiding elasticity cross board empennage is that a plurality of cross one another wing plates form, and at cross one another wing plate infall the connection cylinder can be set;
The structural parameters span is: D/d=0.95～1.05, S
Max/ d=0.7～1.0, F
Max/ d=1.03～1.2, (S
z+ W
z)/d=0.8～1.5, W
Min/ d=0.5～1.0, wherein, D is the face of cylinder diameter of the revolution envelope outline of a plurality of cylinder outline fin top, S
MaxThe full-size of solid revolving body, F
MaxThe largest enveloping outer profile size of cylinder outline fin, (S
z+ W
z) be the axial length of described cleaning and descaling component, W
MinBe the minimum bar seam of the cross section size of described guiding elasticity cross board empennage, d is the internal diameter of heat exchanger tube.
Described a plurality of cylinder outline fin is inclining fin, or helical fin, or is interrupted circumferential fin, or the intersection fin.
Described solid revolving body is short cylinder, two ends rounding or the chamfering of short cylinder.
The present invention is owing to take above technical scheme, it has the following advantages: after described cleaning and descaling component enters in the heat exchanger tube, because the revolution enveloping surface of cylinder outline fin is that the revolution envelope outline full-size of cylinder and fin is obviously greater than the heat exchanger tube internal diameter, so described cleaning and descaling component keeps the dead in line of axis of rotation and the heat exchanger tube of described cleaning and descaling component in heat exchanger tube as far as possible, little inclination or the skew of axis of rotation appearance when described cleaning and descaling component, the cylinder outline fin of described cleaning and descaling component will be under the effect of the reaction force of heat exchange tube inwall, make described cleaning and descaling component get back to desirable design point described above, can not occur obviously tilting or upset, the scale removal of heat exchanger tube inner wall washing is even, thereby it is good and be not easy to stop up the characteristics of heat exchanger tube to have a cleaning performance; Simultaneously because guiding elasticity cross board empennage adopts a plurality of cross one another wing plates or wing plate and the structure that cylinder forms, can not occur in the mesh of described cleaning and descaling component insertion ball screen and the slit and affect the problem of ball collecting rate.
Description of drawings
Fig. 1 is embodiments of the invention 1 structural representations.
Fig. 2 is the right view of Fig. 1.
Fig. 3 is the three-dimensional structure schematic diagram of embodiments of the invention 1.
Fig. 4 is the three-dimensional structure schematic diagram of the cylinder outline fin of embodiments of the invention 1.
Fig. 5 is embodiments of the invention 1 operation principle schematic diagram (be in pipe end, elasticity cross board empennage is rear).
Fig. 6 is embodiments of the invention 1 operation principle schematic diagram (be in pipe end, elasticity cross board empennage is front).
Fig. 7 is embodiments of the invention 1 operation principle schematic diagram (being in the pipe).
Fig. 8 is contrast operation principle schematic diagram.
Fig. 9 is the structural representation of embodiments of the invention 2.
Figure 10 is the right view of Fig. 9.
Figure 11 is the three-dimensional structure schematic diagram of embodiments of the invention 2.
Figure 12 is the three-dimensional structure schematic diagram of the cylinder outline fin of embodiments of the invention 2.
Figure 13 is the structural representation of embodiments of the invention 3.
Figure 14 is the right view of Figure 13.
Figure 15 is the three-dimensional structure schematic diagram of embodiments of the invention 3.
Figure 16 is the structural representation of embodiments of the invention 4.
Figure 17 is the right view of Figure 16.
Figure 18 is the three-dimensional structure schematic diagram of embodiments of the invention 4.
Figure 19 is the structural representation of embodiments of the invention 5.
Figure 20 is the right view of Figure 19.
Figure 21 is the three-dimensional structure schematic diagram of embodiments of the invention 5.
Figure 22 is embodiments of the invention 6 structural representations.
Figure 23 is the right view of Figure 22.
Figure 24 is the three-dimensional structure schematic diagram of embodiments of the invention 6.
Figure 25 is the structural representation of embodiments of the invention 7.
Figure 26 is the left view of Figure 25.
Figure 27 is the right view of Figure 25.
Figure 28 is the three-dimensional structure schematic diagram of embodiments of the invention 7.
Figure 29 is the structural representation of embodiments of the invention 8.
Figure 30 is the structural representation of embodiments of the invention 9.
Figure 31 is the structural representation of embodiments of the invention 10.
Figure 32 is the three-dimensional structure schematic diagram of embodiments of the invention 11.
Number in the figure:
The solid revolving body of 1-; 2-cylinder outline fin; The root of 201-cylinder outline fin; The top of 202-cylinder outline fin; The two sides of 203-cylinder outline fin; 3-guiding elasticity cross board empennage; 4-cleaning and descaling component design rotation; 5-heat exchanger tube to be cleaned; The axis of 6-heat exchanger tube to be cleaned; The face of cylinder diameter of the revolution envelope outline of many cylinder outlines of D-fin top; S
MaxThe full-size of-solid revolving body; S
zThe axial dimension of-solid revolving body; F
MaxThe revolution envelope outline full-size of-fin; W
x-guiding elasticity cross board empennage is at the longitudinal size of shown position; W
y-guiding elasticity cross board empennage is at the lateral dimension of shown position; W
z-guiding elasticity cross board empennage axial dimension; W
MinThe minimum bar seam of-empennage cross section size; S
z+ W
zThe axial length of-cleaning and descaling component; D-heat exchanger tube internal diameter; Φ-expression parameter thereafter is the revolving structure size.
The specific embodiment
The invention provides cleaning and descaling component in a kind of heat exchanger tube, below in conjunction with drawings and Examples the present invention is described in detail.
Embodiment 1:
Fig. 1 is embodiments of the invention 1 structural representations, Fig. 2 is the right view of Fig. 1, Fig. 3 is the three-dimensional structure schematic diagram of embodiments of the invention 1, Fig. 4 is the three-dimensional structure schematic diagram of the cylinder outline fin of embodiments of the invention, Fig. 5, Fig. 6 and Fig. 7 are embodiments of the invention 1 operation principle schematic diagrames, wherein Fig. 5 is that cleaning and descaling component is in the heat exchanger tube end in a kind of heat exchanger tube of present embodiment, its elasticity cross board empennage is rear, namely this cleaning and descaling component is in certain moment that enters heat exchanger tube, Fig. 6 is that the interior cleaning and descaling component of a kind of heat exchanger tube of present embodiment is in the heat exchanger tube end, its elasticity cross board empennage is front, namely this cleaning and descaling component is in certain moment that enters heat exchanger tube, Fig. 7 is that cleaning and descaling component is in the pipe of heat exchanger tube in a kind of heat exchanger tube of present embodiment, namely this cleaning and descaling component be in cleaning and descaling duty in the pipe of heat exchanger tube certain constantly.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.Short cylinder described in the present embodiment refers to that its axial length is not more than its body diameter.In the present embodiment, cylinder outline fin 2 is the inclining fin that tilts with solid revolving body axis of rotation, the root 201 of cylinder outline fin and solid revolving body are that the outer surface of short cylinder is connected, and the revolution enveloping surface at the top 202 of cylinder outline fin is approximately two ends rounding or the chamfering of cylindrical shell and this cylindrical shell.The revolution enveloping surface at the top 202 of the described a plurality of cylinder outline fins that circumferentially are evenly arranged at solid revolving body is on an approximate cylindrical shell, and two ends rounding or the chamfering of this cylindrical shell.Described " an approximate cylindrical shell ", mainly be to consider to have manufacture deviation, desirable design point should be: all the revolution enveloping surface at the top 202 of cylinder outline fin is the cylinder outer surface of a two ends rounding or chamfering, in other words, the top 202 of whole cylinder outline fins has the cylinder outer surface of a two ends rounding or chamfering.
In the present embodiment, guiding elasticity cross board empennage 3 is that 4 mutual cross-coupled wing plates form, when described cleaning and descaling component is in position shown in Figure 2,4 mutual cross-coupled wing plates are respectively that 3 transverse slats and 1 riser interconnection are integrated, and an end of guiding elasticity cross board empennage 3 is connected with an axial end of solid revolving body 1.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.
Cleaning and descaling component needs a kind of collecting net (being referred to as ball screen in the existing rubber ball cleaning system) that it is collected and Reusability behind the cleaning and descaling of finishing a heat exchanging inside pipe wall in a kind of heat exchanger tube of the present invention.Because collecting net/ball screen has many mesh and slit, described cleaning and descaling component might insert can't be regained in its mesh and the slit and affect ball collecting rate.Insert in its mesh and the slit for fear of cleaning and descaling component, the cross sectional dimensions of the empennage of described cleaning and descaling component should be greater than the size in mesh and slit, but enter smoothly heat exchanger tube in order to guide described cleaning and descaling component, its guiding empennage should have good elasticity to avoid stopping up heat exchanger tube, therefore guide the structure that empennage adopts above-mentioned mutual cross-coupled wing plate to form, both can describedly avoid cleaning and descaling component to insert its mesh and slit and nonrecoverable problem, and also can have good drive characteristic and avoid stopping up the problem of heat exchanger tube.Owing to be generally rectangular mesh and slit on the ball screen, define the minimum bar seam of empennage cross section size W
Min, the rectangular mesh on ball screen and gap size are equal to, or greater than the minimum bar seam of empennage cross section size W
MinThe time, the guiding elasticity cross board empennage of described cleaning and descaling component may insert in this mesh and the slit, i.e. W
MinIt is the minimum bar seam of the cross section size of described guiding elasticity cross board empennage.For present embodiment, W
Min≈ Min{W
x, W
y, namely minimum bar stitches size W
MinBe approximately equal to the cross section longitudinal size W of the guiding elasticity cross board empennage of described cleaning and descaling component
xWith lateral dimension W
yMinimum of a value.May insert in this mesh and the slit General Requirements W for fear of described cleaning and descaling component
Min/ d 〉=0.5; For fear of stopping up heat exchanger tube, General Requirements W
Min/ d≤1.Namely, General Requirements W
Min/ d=0.5-1.0.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, General Requirements W
Min/ d=0.5-1.0 can avoid the directed empennage of similar documents 2 to be inserted in easily can't regaining in the mesh of ball screen and the slit and affects the problem of ball collecting rate.
In the present embodiment, the effect of guiding elasticity cross board empennage 3 is when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guiding described cleaning and descaling component enters in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component, such as Fig. 5, shown in Figure 6.After described cleaning and descaling component enters in the heat exchanger tube, because the revolution enveloping surface of cylinder outline fin is the revolution envelope outline full-size F of cylinder and fin
MaxObviously greater than the heat exchanger tube inner diameter d, general F
Max/ d=1.03～1.2, so described cleaning and descaling component keeps by moving under the desirable design point as shown in Figure 7 in heat exchanger tube as far as possible, the axis of rotation 4 that described desirable design point is described cleaning and descaling component overlaps with the axis 6 of heat exchanger tube, little inclination or the skew of axis of rotation appearance when described cleaning and descaling component, the cylinder outline fin of described cleaning and descaling component will be under the effect of the reaction force of heat exchange tube inwall, make described cleaning and descaling component get back to desirable design point described above, can not occur obviously tilting or upset, the scale removal of heat exchanger tube inner wall washing is even, thereby cleaning performance is better.When described cleaning and descaling component enters in the heat exchanger tube, 3 pairs of directions controls of guiding elasticity cross board empennage are just substantially inoperative, and as shown in Figure 7, these are obviously different from documents 2.
In the present embodiment, the feature structure parameter of cleaning and descaling component is: d=23.6mm～24mm, D/d=0.98～1.00, S
Max/ d=0.91～0.93, F
Max/ d=1.08～1.1, (S
z+ W
z)/d ≈ 1.1, W
Min/ d=0.7～0.8.D is excessive for the face of cylinder diameter of the revolution envelope outline at the top 202 of a plurality of cylinder outline fins 2 (or referred to as cylinder outline fin cylinder external diameter), then might be stuck in heat exchanger tube end or heat exchanger tube; Cylinder outline fin cylinder outer diameter D is too small, and then the cleaning and descaling effect is relatively poor, general D/d=0.95～1.05.The full-size S of solid revolving body
MaxExcessive, then might be stuck in the heat exchanger tube end; The full-size S of solid revolving body
MaxToo small, then described cleaning and descaling component may obviously tilt, and the part inclination wing that has that aforementioned documents 2 occurs does not have the problem of contact heat-exchanging inside pipe wall, thereby affects the cleaning and descaling effect, general S
Max/ d=0.7～1.0.The revolution envelope outline full-size F of fin
MaxExcessive, then might be stuck in heat exchanger tube end or heat exchanger tube; The revolution envelope outline full-size F of fin
MaxToo small, then described cleaning and descaling component may obviously tilt or overturn, and the part inclination wing that has that aforementioned documents 2 occurs does not have the problem of contact heat-exchanging inside pipe wall, thereby affects the cleaning and descaling effect, general F
Max/ d=1.03～1.2.Guiding elasticity cross board empennage is too short, and the guide function of empennage is partly lost, and overturns easily the cleaning and descaling weak effect in heat exchanger tube; Guiding elasticity cross board empennage is long, and cleaning and descaling component is blocked in the heat exchanger tube end easily, general (S
z+ W
z)/d=0.8～1.5.The cross section outer profile size of guiding elasticity cross board empennage is too small, occurs easily that empennage is inserted in the mesh of ball screen and the slit and the problem that affect ball collecting rate, and the cross section outer profile size of guiding elasticity cross board empennage is excessive, stops up easily heat exchanger tube, generally W
Min/ d=0.5～1.0.Therefore, consider above-mentioned factor, the feature structure parameter value scope of general cleaning and descaling component is: D/d=0.95～1.05, S
Max/ d=0.7～1.0, F
Max/ d=1.03～1.2, (S
z+ W
z)/d=0.8～1.5, W
Min/ d=0.5～1.0.
For convenient withdrawing pattern and the Mould Machining made, fin, empennage etc. need to arrange pattern draft, in the top of fin, empennage etc. and end and the each several part junction rounding or chamfering need to be set.Clear in order to illustrate, in the accompanying drawing of embodiment, the pattern draft of fin etc. and part rounding or chamfering be in the accompanying drawings expression not.
The operation principle schematic diagram of documents 2 described cleaning and descaling components is seen Fig. 8.As can be seen from Figure 8, documents 2 described cleaning and descaling components are in heeling condition usually, both the axis of the gyroaxis of described cleaning and descaling component and heat exchanger tube was at a certain angle, this mainly is because the outline of inclining fin is sphere, its position mainly is subjected to the control of its directed empennage, and because its directed empennage has larger elasticity, is easy to bending, thereby so that obvious inclination probably appears in described cleaning and descaling component, affect its cleaning and descaling effect.Fig. 7 is the operation principle schematic diagram of present embodiment 1, contrast documents shown in Figure 82 described cleaning and descaling components, because the revolution enveloping surface (top 202 of fin) of the cylinder outline fin that present embodiment 1 arranges is cylindrical, add solid revolving body and be short cylinder but not spheroid, so that described cleaning and descaling component obvious inclination can not occur, the cleaning and descaling effect is better.
A plurality of rotating fins that the solid revolving body of present embodiment circumferentially is evenly arranged outward are the inclination wing, also can be the spiral wing.A plurality of cylinder outline fins of present embodiment are 8 inclination wings, also can be 6,10 or 12 etc., the quantity of inclination wing or spiral wing generally should be less than 6, otherwise affect the cleaning and descaling effect, the inclination wing of same circumferential arrangement or the quantity of spiral wing generally should be greater than 12, otherwise are difficult between processing and fin easily build-up of dirt, foreign material.The effect of inclination wing is the effect that scraping heat exchanger tube internal face obtains cleaning and descaling, and tube fluid high velocity stream between the inclination wing is crossed the effect of playing too cleaning and descaling, also washes away the silt, foreign material, microorganism of cleaning and descaling component front end etc. simultaneously.The inclination wing also is difficult for stopping up heat exchanger tube also so that this cleaning and descaling component produces rotation.The cleaning and descaling component of present embodiment is compared with existing sponge glueballs, because silt, foreign material, microorganism etc. are in time taken away by fluid, and under the effect of fluid, can produce rotation, thereby have the advantages that be difficult for to stop up heat exchanger tube, but also having the effective and little characteristics of flow resistance of cleaning and descaling, the cleaning and descaling component of present embodiment is compared with documents 2, owing to obvious inclination can not occur, cleaning and descaling is even, and the cleaning and descaling effect is better; Can not occur in the mesh and slit that empennage is inserted in ball screen, ball collecting rate is high.
Embodiment 2:
Fig. 9 is the structural representation of embodiments of the invention 2, and Figure 10 is the right view of Fig. 9, and Figure 11 is the three-dimensional structure schematic diagram of embodiments of the invention 2, and Figure 12 is the three-dimensional structure schematic diagram of the cylinder outline fin of embodiments of the invention 2.In Fig. 9, Figure 10, Figure 11 and Figure 12, W
Min≈ 0.7Min{W
x, W
y, namely guide the minimum bar seam of the cross section size W of elasticity cross board empennage
MinBe approximately equal to the cross section longitudinal size W of guiding elasticity cross board empennage of 0.7 times described cleaning and descaling component
xWith lateral dimension W
vMinimum of a value, General Requirements W
Min/ d=0.5-1.0.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.In the present embodiment, cylinder outline fin 2 is the vertical wrong row's of circumferential revolution array of a plurality of and solid revolving body axis of rotation the circumferential fin of interruption, every group of axis near normal of circumferentially turning round fin face median plane or side and the solid revolving body of layout namely, the root 201 of cylinder outline fin and solid revolving body are that the outer surface of short cylinder is connected, the top 202 of a plurality of cylinder outline fins is similar on a cylindrical shell, and two ends rounding or the chamfering of cylindrical shell, or say that the revolution enveloping surface at the top 202 of the cylinder outline fin of a plurality of inclinations is the cylinder outer surface of a two ends rounding or chamfering.Outside cylinder outline fin 9 in the present embodiment is 4 groups and circumferentially turns round the wrong row of array that every group of fin that circumferentially turns round layout has 6 to be interrupted circumferential fin, amounts to 36 and is interrupted circumferential fin.
In the present embodiment, the effect of guiding elasticity cross board empennage 3 is when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guide described cleaning and descaling component and enter in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component.In the present embodiment, guiding elasticity cross board empennage 3 is that 3 mutual cross-coupled wing plates form, when described cleaning and descaling component is in position shown in Figure 10,3 mutual cross-coupled wing plates are respectively that 2 transverse slats and 1 riser interconnection are integrated, and an end of guiding elasticity cross board empennage 3 is connected with an end of solid revolving body 8.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, can avoids directed empennage to be inserted in easily in the mesh of ball screen and the slit and affect the problem of ball collecting rate.
The main difference part of present embodiment and embodiment 1 is: the outside cylinder outline fin of embodiment 1 is inclining fin, and the outside cylinder outline fin of embodiment 2 is for being interrupted circumferential fin; The guiding elasticity cross board empennage of embodiment 1 is that 4 mutual cross-coupled wing plates form, and the guiding elasticity cross board empennage of embodiment 2 is 3 mutual cross-coupled wing plates compositions.The cleaning and descaling effect of embodiment 2 is better, is not easy to stop up foreign material between the fin of embodiment 1, and flow resistance is less.
Embodiment 3:
Figure 13 is the structural representation of embodiments of the invention 3, and Figure 14 is the right view of Figure 13, and Figure 15 is the three-dimensional structure schematic diagram of embodiments of the invention 3.In Figure 13, Figure 14 and Figure 15, W
Min≈ Min{W
x, W
y.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.In the present embodiment, cylinder outline fin 2 is the helical fin of the circumferential revolution array of a plurality of and solid revolving body axis of rotation spiral, helical fin is divided into 2 groups, and every group comprises 8 helical fins, and totally 16 helical fins circumferentially are evenly arranged in solid revolving body outer cylinder surface.A plurality of cylinder outline fins circumferentially are evenly arranged in the periphery of described solid revolving body, and its root is connected with the outer surface of solid revolving body, and the revolution enveloping surface at its top is the cylinder outer surface of a two ends rounding or chamfering.
In the present embodiment, the effect of guiding elasticity cross board empennage 3 is when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guide described cleaning and descaling component and enter in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component.In the present embodiment, guiding elasticity cross board empennage 3 is that 2 mutual cross-coupled wing plates and a connecting cylinder body form, the connecting cylinder body is the center of the wing plate of right-angled intersection, and an end of guiding elasticity cross board empennage 3 is connected with an end of solid revolving body 1.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 and cylinder form, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, can avoids directed empennage to be inserted in easily in the mesh of ball screen and the slit and affect the problem of ball collecting rate.
The main difference part of present embodiment and embodiment 1 is: the outside cylinder outline fin of embodiment 1 is one group of inclining fin that is evenly arranged around solid revolving body outer cylinder surface, and the outside cylinder outline fin of embodiment 2 is 2 groups of helical fins that are evenly arranged around solid revolving body outer cylinder surface; The guiding elasticity cross board empennage of embodiment 1 is that 4 mutual cross-coupled wing plates form, and the guiding elasticity cross board empennage of embodiment 2 wing plate that to be 2 mutual right-angled intersections connect connects a cylinder and forms with being connected.
Embodiment 4:
Figure 16 is the structural representation of embodiments of the invention 4, and Figure 17 is the right view of Figure 16, and Figure 18 is the three-dimensional structure schematic diagram of embodiments of the invention 4.In Figure 16, Figure 17 and Figure 18, W
Min≈ Min{W
x, W
y.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.In the present embodiment, cylinder outline fin 2 is the inclining fin of 8 circumferential revolution arrays that tilt with solid revolving body axis of rotation, circumferentially is evenly arranged in solid revolving body outer cylinder surface.The root of a plurality of cylinder outline fins is connected with the outer surface of solid revolving body, and the revolution enveloping surface at the top of a plurality of cylinder outline fins is the cylinder outer surface of a two ends rounding or chamfering.
In the present embodiment, the effect of guiding elasticity cross board empennage 3 is when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guide described cleaning and descaling component and enter in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component.In the present embodiment, guiding elasticity cross board empennage 3 is that 4 mutual cross-coupled wing plates form, and wherein comprises long wing plate and 2 and the cross-coupled short limb plate composition of long wing plate that 2 right-angled intersections connect.One end of guiding elasticity cross board empennage 3 is connected with an end of solid revolving body 1.The structure of this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, can avoids directed empennage to be inserted in easily in the mesh of ball screen and the slit and affect the problem of ball collecting rate.
Present embodiment from the main difference part of embodiment 1 is: the structure of guiding elasticity cross board empennage is different.
Embodiment 5:
Figure 19 is the structural representation of embodiments of the invention 5, and Figure 20 is the right view of Figure 19, and Figure 21 is the three-dimensional structure schematic diagram of embodiments of the invention 5.In Figure 19, Figure 20 and Figure 21, W
Min≈ Min{W
x, W
y.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.In the present embodiment, cylinder outline fin 2 is the inclining fin of 8 circumferential revolution arrays that tilt with solid revolving body axis of rotation, circumferentially is evenly arranged in solid revolving body outer cylinder surface.The root of a plurality of cylinder outline fins is connected with the outer surface of solid revolving body, and the revolution enveloping surface at the top of a plurality of cylinder outline fins is the cylinder outer surface of a two ends rounding or chamfering.
In the present embodiment, the effect of guiding elasticity cross board empennage 3 is when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guide described cleaning and descaling component and enter in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component.In the present embodiment, guiding elasticity cross board empennage 3 is 8 mutual cross-coupled wing plates and is connected a center and connects a cylinder and form, 8 mutual cross-coupled wing plates are radial even distribution and are connected cylinder with the center and connect as one that the connecting cylinder body is the center of the wing plate of right-angled intersection.One end of guiding elasticity cross board empennage 3 is connected with an end of solid revolving body 1.The structure of this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, can avoids directed empennage to be inserted in easily in the mesh of ball screen and the slit and affect the problem of ball collecting rate.
Present embodiment from the main difference part of embodiment 1 is: the structure of guiding elasticity cross board empennage is different.
Embodiment 6:
Figure 22 is the structural representation of embodiments of the invention 6, and Figure 23 is the right view of Figure 22, and Figure 24 is the three-dimensional structure schematic diagram of embodiments of the invention 6.In Figure 22, Figure 23 and Figure 24, W
Min≈ Min{W
x, W
y.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.In the present embodiment, cylinder outline fin 2 is the inclining fin of 8 circumferential revolution arrays that tilt with solid revolving body axis of rotation, circumferentially is evenly arranged in solid revolving body outer cylinder surface.The root of a plurality of cylinder outline fins is connected with the outer surface of solid revolving body, and the revolution enveloping surface at the top of a plurality of cylinder outline fins is the cylinder outer surface of a two ends rounding or chamfering.
In the present embodiment, the effect of guiding elasticity cross board empennage 3 is when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guide described cleaning and descaling component and enter in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component.In the present embodiment, guiding elasticity cross board empennage 3 is that 3 mutual cross-coupled wing plates form, and wherein comprises 2 arcs and is connected a connection flat board, and an end of guiding elasticity cross board empennage 3 is connected with an end of solid revolving body 1.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 and cylinder form, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.The structure that this again mutual cross-coupled wing plate of guiding elasticity cross board empennage 3 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, can avoids directed empennage to be inserted in easily in the mesh of ball screen and the slit and affect the problem of ball collecting rate.The arc of the guiding elasticity cross board empennage 3 of present embodiment also can adopt the coverboard (such as cylindrical shell) of sealing, affects the characteristics such as its density but enclosure space may accumulate dirt foreign material etc.
Present embodiment from the main difference part of embodiment 1 is: the structure of guiding elasticity cross board empennage is different.
Embodiment 7:
Figure 25 is the structural representation of embodiments of the invention 7, and Figure 26 is the left view of Figure 25, and Figure 27 is the right view of Figure 25, and Figure 28 is the three-dimensional structure schematic diagram of embodiments of the invention 7.In Figure 25, Figure 26, Figure 27 and Figure 28, front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32 lay respectively at the two ends of solid revolving body 1, W
X1And W
X2Respectively that front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32 are at the longitudinal size of Figure 26 and position shown in Figure 27, W
Y1And W
Y2Respectively that front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32 are at the lateral dimension of Figure 26 and position shown in Figure 27, W
Z1And W
Z2Respectively the axial dimension of front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32, the total length W of guiding elasticity cross board empennage
z=W
Z1+ W
Z2In the present embodiment, W
Min≈ Min{W
X1, W
Y1, W
X2, W
Y2, namely guide the minimum bar seam of the cross section size W of elasticity cross board empennage
MinThe cross section longitudinal size of elasticity cross board empennage and the minimum of a value of lateral dimension are guided in the two ends that are approximately equal to described cleaning and descaling component.
In the present embodiment, solid revolving body 1 is short cylinder, two ends rounding or the chamfering of short cylinder.In the present embodiment, outside cylinder outline fin 2 is the inclining fin of 8 circumferential revolution arrays that tilt with solid revolving body axis of rotation, circumferentially is evenly arranged in solid revolving body outer cylinder surface.The root of a plurality of cylinder outline fins is connected with the outer surface of solid revolving body, and the revolution enveloping surface at the top of a plurality of cylinder outline fins is the cylinder outer surface of a two ends rounding or chamfering.
In the present embodiment, guiding elasticity cross board empennage is two, i.e. front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32, lay respectively at the two ends of solid revolving body 1, front guiding elasticity cross board empennage 31 and 32 effects of rear guiding elasticity cross board empennage are when guaranteeing that described cleaning and descaling component enters heat exchanger tube in the heat exchanger tube end, guide described cleaning and descaling component and enter in the heat exchanger tube by the design rotation, and can not produce the horizontal heat exchanger tube end that is stuck in of described cleaning and descaling component.
In the present embodiment, front guiding elasticity cross board empennage 31 is 8 mutual cross-coupled wing plates and is connected a center and connects a paxilla and form, 8 mutual cross-coupled wing plates are radial even distribution and are connected paxilla with the center and connect as one that connecting small cylinder is the center of the wing plate of right-angled intersection.One end of front guiding elasticity cross board empennage 31 is connected with an end of solid revolving body 1.In the present embodiment, rear guiding elasticity cross board empennage 32 is that 4 mutual cross-coupled wing plates form, when described cleaning and descaling component is in position shown in Figure 27,4 mutual cross-coupled wing plates are respectively that 3 transverse slats and 1 riser interconnection are integrated, and an end of rear guiding elasticity cross board empennage 32 is connected with the other end of solid revolving body 1.The structure that this again mutual cross-coupled wing plate of front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32 and cylinder form, has good elasticity, thereby when described cleaning and descaling component is in the heat exchanger tube end, because the good elasticity of empennage can not be blocked in the heat exchanger tube end, have simultaneously the effect of the direction of adjusting described cleaning and descaling component, guide described cleaning and descaling component so that described cleaning and descaling component can enter in the heat exchanger tube smoothly.The structure that this again mutual cross-coupled wing plate of front guiding elasticity cross board empennage 31 and rear guiding elasticity cross board empennage 32 forms, because its outer profile size is obviously greater than mesh and the slit of ball screen, can avoids directed empennage to be inserted in easily in the mesh of ball screen and the slit and affect the problem of ball collecting rate.
The main difference part of present embodiment and embodiment 1 is: embodiment 1 is a guiding elasticity cross board empennage, is positioned at an end of solid revolving body, and embodiment 7 is two guiding elasticity cross board empennages, is positioned at the two ends of solid revolving body.
Embodiment 8:
Figure 29 is the structural representation of embodiments of the invention 8.Solid revolving body 1 is drum shaped body in Figure 29, the inclination wing of cylinder outline fin 2 for circumferentially being evenly arranged.In the present embodiment, solid revolving body 1 is cone table.The cross-sectional structure of the guiding elasticity cross board empennage of present embodiment is identical with embodiment 1.
The difference of present embodiment and embodiment 1 is: the solid revolving body of embodiment 1 is the short cylinder of two ends rounding, and the solid revolving body of embodiment 8 is drum shaped body.
Embodiment 9:
Figure 30 is the structural representation of embodiments of the invention 9.In Figure 30, solid revolving body 1 is taper type, the inclination wing of cylinder outline fin 2 for circumferentially being evenly arranged.The cross-sectional structure of the guiding elasticity cross board empennage of present embodiment is identical with embodiment 1.
The difference of present embodiment and embodiment 1 is: the solid revolving body of embodiment 1 is the short cylinder of two ends rounding, and the solid revolving body of embodiment 9 is cone table.
Embodiment 10:
Figure 31 is the structural representation of embodiments of the invention 10.In Figure 31, solid revolving body 1 is spherical, the inclination wing of a plurality of cylinder outline fins 2 for circumferentially being evenly arranged.In the present embodiment, solid revolving body 1 is spherosome, also can be spheroid.In Figure 31, S is sphere diameter.The cross-sectional structure of the guiding elasticity cross board empennage of present embodiment is identical with embodiment 1.
The difference of present embodiment and embodiment 1 is: the solid revolving body of embodiment 1 is the short cylinder of two ends rounding, and the solid revolving body of embodiment 10 is spherical.
Embodiment 11:
Figure 32 is the three-dimensional structure schematic diagram of embodiments of the invention 11.In Figure 32, solid revolving body 1 is the cylinder of rounding, a plurality of dextrorotation cylinder outline fins 21 circumferentially are evenly arranged outside the rounding cylinder and the fin root is connected with rounding cylinder outer surface, and a plurality of left-handed cylinder outline fins 22 circumferentially are evenly arranged outside the rounding cylinder and the fin root is connected with rounding cylinder outer surface; A plurality of dextrorotation cylinder outline fins 21 and the 22 mutual interconnections of a plurality of left-handed cylinder outline fin.The root of a plurality of dextrorotation cylinder outline fins 21 is connected with the outer surface of solid revolving body, and the revolution enveloping surface at the top of a plurality of dextrorotation cylinder outline fins 21 is the cylinder outer surface of a two ends rounding or chamfering.The root of a plurality of left-handed cylinder outline fins 22 is connected with the outer surface of solid revolving body, and the revolution enveloping surface at the top of a plurality of left-handed cylinder outline fins 22 is the cylinder outer surface of a two ends rounding or chamfering.In an embodiment, the diameter on the face of cylinder of the top revolution enveloping surface of above-mentioned two fins set is not identical, and wherein the diameter on the face of cylinder of dextrorotation cylinder outline fin top revolution enveloping surface is greater than the diameter on the face of cylinder of left-handed cylinder outline fin top revolution enveloping surface.
In the present embodiment, solid revolving body 1 is the cylinder of two ends rounding.The cross-sectional structure of the guiding elasticity cross board empennage of present embodiment is identical with embodiment 5.
The main difference part of present embodiment and embodiment 1 is: the cylinder outline fin of embodiment 1 is the cylinder outline fin of unidirectional inclination, and the cylinder outline fin of embodiment 11 is the cross-coupled cylinder outline fin that tilts or the fin that claims to intersect; The structure of guiding elasticity cross board empennage is also different.Embodiment's 1 is simple in structure, and embodiment 11 cleaning and descaling effects are better.
Claims (3)
1. cleaning and descaling component in the heat exchanger tube is characterized in that this cleaning and descaling component contains: a solid revolving body (1), a plurality of cylinder outline fins (2) and one or two are guided elasticity cross board empennage (3), wherein:
Described solid revolving body (1) is cylinder, drum shaped body, cone table, spheroid or spheroid, and solid revolving body (1) is when being cylinder, drum shaped body, cone table, its two ends rounding or chamfering;
Described a plurality of cylinder outline fins (2) circumferentially are evenly arranged in the periphery of described solid revolving body (1), and the root of described cylinder outline fin (2) is connected with the outer surface of solid revolving body (1); The revolution enveloping surface at described a plurality of cylinder outline fins (2) top is the cylinder outer surface of a two ends rounding or chamfering;
Described guiding elasticity cross board empennage (3) is positioned at the axial end of described solid revolving body (1) or two ends and is connected with the end of solid revolving body (1), described guiding elasticity cross board empennage (3) is that a plurality of cross one another wing plates form, and at cross one another wing plate infall the connection cylinder can be set;
The structural parameters span is: D/d=0.95～1.05, S
Max/ d=0.7～1.0, F
Max/ d=1.03～1.2, (S
z+ W
z)/d=0.8～1.5, W
Min/ d=0.5～1.0, wherein, D is the face of cylinder diameter of the revolution envelope outline at a plurality of cylinder outline fins (2) top, S
MaxThe full-size of solid revolving body (1), F
MaxThe largest enveloping outer profile size of cylinder outline fin (2), (S
z+ W
z) be the axial length of described cleaning and descaling component, W
MinBe the minimum bar seam of the cross section size of described guiding elasticity cross board empennage (3), d is the internal diameter of heat exchanger tube.
2. cleaning and descaling component in a kind of heat exchanger tube according to claim 1, it is characterized in that: described a plurality of cylinder outline fins (2) be inclining fin, or helical fin, or are interrupted circumferential fin, or the intersection fin.
3. cleaning and descaling component in a kind of heat exchanger tube according to claim 1, it is characterized in that: described solid revolving body (1) is short cylinder, two ends rounding or the chamfering of short cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110007108 CN102155861B (en) | 2011-01-13 | 2011-01-13 | Cleaning and descaling element in heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110007108 CN102155861B (en) | 2011-01-13 | 2011-01-13 | Cleaning and descaling element in heat exchange tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102155861A CN102155861A (en) | 2011-08-17 |
| CN102155861B true CN102155861B (en) | 2013-01-30 |
Family
ID=44437446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110007108 Expired - Fee Related CN102155861B (en) | 2011-01-13 | 2011-01-13 | Cleaning and descaling element in heat exchange tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102155861B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111645218B (en) * | 2020-05-25 | 2021-12-03 | 扬州中欣高分子材料有限公司 | Polymer particle water cooling plant with antiseized wall function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5105498A (en) * | 1990-02-21 | 1992-04-21 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V. | Device for cleaning a sewer |
| CN101033929A (en) * | 2007-04-18 | 2007-09-12 | 清华大学 | Member for online cleaning and removing scale of heat exchange tube |
| CN101762208A (en) * | 2009-12-31 | 2010-06-30 | 清华大学 | On-line cleaning and de-dusting element of heat exchange tube with directional tail wing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61149797A (en) * | 1984-12-21 | 1986-07-08 | Bridgestone Corp | Scale removing ball |
-
2011
- 2011-01-13 CN CN 201110007108 patent/CN102155861B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5105498A (en) * | 1990-02-21 | 1992-04-21 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V. | Device for cleaning a sewer |
| CN101033929A (en) * | 2007-04-18 | 2007-09-12 | 清华大学 | Member for online cleaning and removing scale of heat exchange tube |
| CN101762208A (en) * | 2009-12-31 | 2010-06-30 | 清华大学 | On-line cleaning and de-dusting element of heat exchange tube with directional tail wing |
Non-Patent Citations (1)
| Title |
|---|
| JP昭61-149797A 1986.07.08 |
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