CN112665419B - Direct-insertion filler strip type wound tube heat exchanger - Google Patents
Direct-insertion filler strip type wound tube heat exchanger Download PDFInfo
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Abstract
The invention provides a straight-inserting filler strip type wound tube heat exchanger, wherein a straight-inserting filler strip is arranged on a core cylinder of the wound tube heat exchanger along the radial direction, a medium flows through the straight-inserting filler strip transversely to form turbulent flow between heat exchange tubes, a wake flow field formed by a tube bundle is strengthened, and a flow boundary layer and a thermal boundary layer on the outer wall surface of the heat exchange tubes are effectively reduced. Two rows of positioning grooves are arranged on the direct-insertion type filler strip; the first row of positioning grooves comprise a plurality of first positioning grooves arranged along the length direction of the packing strip body, and the second row of positioning grooves comprise a plurality of second positioning grooves arranged along the length direction of the packing strip body; the first positioning grooves and the second positioning grooves are arranged in a staggered mode, the first positioning grooves are used for positioning the odd/even layers of heat exchange tubes respectively, and the second positioning grooves are used for positioning the even/odd layers of heat exchange tubes respectively. The invention can realize the purpose of further strengthening heat exchange only by improving the filler strip and the arrangement mode thereof.
Description
Technical Field
The invention relates to the field of industrial heat exchangers, in particular to a wound tube type heat exchanger.
Background
The winding tube type heat exchanger is a typical shell-and-tube type heat exchanger, a heat exchange tube bundle of the winding tube type heat exchanger is wound in a space between a core barrel and an outer barrel in a staggered mode according to a spiral line shape, the spiral directions of two adjacent layers of heat exchange tubes are opposite, and a certain distance is kept between the two adjacent layers of heat exchange tubes by adopting a certain-shaped backing strip. The heat exchanger has the advantages of compact structure, high pressure resistance, high heat transfer efficiency, large heat exchange area per unit volume and the like. The reverse winding between the layers of the wound tube type heat exchanger can form a strong turbulent flow effect on the shell side; the spiral pipeline also has a strengthening effect on the flow in the pipeline; meanwhile, the components such as the filler strip and the like disturb the flow of the shell pass, and the heat transfer performance of the wound tube type heat exchanger is obviously improved due to the combined action of the three components.
Studies have found that the flow of wound tube heat exchangers is very complex on the shell side, and the helical winding of the heat exchanger tube bundle causes a strong turbulence of the shell side flow. But the flowing speed of the shell side medium in the space between two adjacent heat exchange tubes in the same layer is low, so that the heat transfer coefficient of a local area is low.
Disclosure of Invention
In order to achieve the purpose of further strengthening heat exchange in the existing space through simple and convenient operation, the invention provides a direct insertion type gasket type wound tube type heat exchanger.
The technical scheme of the invention is as follows:
the direct-insert filler strip type wound tube heat exchanger comprises a heat exchanger outer cylinder, a core cylinder, a plurality of layers of heat exchange tubes and a plurality of filler strips;
the heat exchange tubes are wound in a staggered manner in a spiral line shape and are arranged in a space between the outer cylinder and the core cylinder of the heat exchanger, the spiral directions of the adjacent two layers of heat exchange tubes are opposite, and the spiral radius of the outer layer of heat exchange tube is larger than that of the inner layer of heat exchange tube;
each layer of heat exchange tube bundle comprises a plurality of heat exchange tubes which are uniformly distributed along the circumference; the pitch, the spiral radius and the spiral direction of the heat exchange tubes positioned on the same layer are the same;
it is characterized in that:
the filler strip is a direct-insert filler strip and is radially arranged on the core cylinder of the wound tube type heat exchanger, and at least one direct-insert filler strip is arranged in a gap between every two adjacent heat exchange tubes of each layer of heat exchange tube bundle; the direct-insertion type filler strip is used for controlling the interlayer spacing between different layers of heat exchange tubes and the tube spacing between the heat exchange tubes on the same layer;
the direct-insertion type filler strip comprises a filler strip body, and two rows of positioning grooves are formed in the filler strip body along the width direction of the filler strip body;
the first row of positioning grooves comprise a plurality of first positioning grooves arranged at intervals along the length direction of the packing strip body, and the second row of positioning grooves comprise a plurality of second positioning grooves arranged at intervals along the length direction of the packing strip body;
the first positioning grooves and the second positioning grooves are arranged in a staggered mode, the first positioning grooves are used for positioning the odd/even layers of heat exchange tubes respectively, and the second positioning grooves are used for positioning the even/odd layers of heat exchange tubes respectively;
the shapes and the sizes of the first positioning groove and the second positioning groove are matched with the heat exchange tubes supported by the first positioning groove and the second positioning groove;
in the length direction of the filler strip body, the distance between the adjacent first positioning grooves and the second positioning grooves is the layer distance between the two corresponding layers of heat exchange tubes; the distance from the bottom of each positioning groove to the bottom surface of the filler strip body is the tube space between two adjacent heat exchange tubes in the same layer corresponding to the positioning groove.
Further, the length direction of the straight-inserting type cushion strip is perpendicular to the incoming flow direction.
Furthermore, the first positioning groove and the second positioning groove both have a certain inclination angle theta, so that the first positioning groove and the second positioning groove are in surface contact with each other; the tilt angle θ is calculated according to the following formula:
wherein R is the spiral radius of the first layer of heat exchange tubes; l is the screw pitch of the first layer of heat exchange tubes; the first layer of heat exchange tubes refers to the layer of heat exchange tubes with the smallest spiral radius in the heat exchanger.
Further, the filler strip body is U-shaped, I-shaped or claw-shaped.
Furthermore, a plurality of standby grooves are also arranged on the filler strip body.
Furthermore, the direct-inserting type filler strips between every two adjacent heat exchange tubes in the same layer are arranged in an aligned mode.
Furthermore, the direct-insertion filler strips between every two adjacent heat exchange tubes in the same layer are arranged in a staggered mode.
Further, the straight-inserting filler strips between every two adjacent heat exchange tubes in the same layer are spirally arranged.
The invention has the beneficial effects that:
1. according to the invention, the direct-insert filler strip is arranged on the inner wall of the core barrel along the radial direction, and the medium flows through the direct-insert filler strip in a transverse manner to form turbulent flow between the heat exchange tubes, so that the turbulent flow strength of the medium in the filler strip area is increased, the flow boundary layer and the thermal boundary layer of the outer wall surface of the heat exchange tubes are effectively reduced, and the heat exchange effect is enhanced.
2. The direct-insert type filler strip is used as a spacer between the heat exchange tubes on the same layer and between different layers of the wound tube type heat exchanger and also can be used as a vortex generator, and a shell-side medium can generate vortex at the downstream when flowing through the direct-insert type filler strip in a transverse mode to form secondary circulation, so that fluid enters the adjacent heat exchange tubes on the same layer in a tangential direction under certain pressure to do violent rotary motion, and a main fluid on the shell side of the heat exchanger scours the tube wall between the heat exchange tubes on each layer in the axial direction and also scours the area between the adjacent heat exchange tubes on the same layer.
3. In the existing space, the purpose of further strengthening heat exchange can be realized only by improving the filler strips and the arrangement mode thereof through simple and convenient operation, the heat exchanger does not need to be improved, the improvement cost is low, and the universality is high.
4. Compared with the traditional filler strip structure and the installation mode in the wound tube type heat exchanger, the filler strip has larger contact area with the heat exchange tube under the same volume compared with the traditional filler strip structure, and the vibration of the heat exchange tube under the normal working condition is effectively prevented; the invention adopts the direct-insertion type gasket strip, the separation distance between layers of the heat exchanger is determined by the distance between the positioning grooves on the direct-insertion type gasket strip, the thickness of the gasket strip is not required to be changed when the heat exchanger increases or decreases the distance between the heat exchange pipes of each layer to improve the flow performance of the shell side, and only the distance between the positioning grooves on the gasket strip is required to be changed, so that the structure of the heat exchanger is more stable.
5. When the straight-inserting type backing strip is installed in a direction perpendicular to the incoming flow direction, the angles and the sizes of the positioning grooves of the heat exchange tube bundles in contact with the backing strip are the same, and the straight-inserting type backing strip is convenient to process.
Drawings
FIG. 1 is a schematic structural diagram of a straight-insertion gasket type wound tube heat exchanger (part of the outer tube of the heat exchanger is removed).
Fig. 2 is a top view of a heat exchange tube bundle and a straight-insert type filler strip (taking 5 heat exchange tubes per layer as an example).
Fig. 3 is an example of the position relationship between the heat exchange tubes and the in-line filler strips (taking 4 heat exchange tubes in each layer and one in-line filler strip arranged between two adjacent heat exchange tubes in the same layer as an example).
FIG. 4 is a schematic diagram of diamond shaped voids formed by two adjacent layers of heat exchange tubes.
FIG. 5 is a schematic diagram of three different forms of in-line underwire configurations, wherein: (a) the figure is a straight line-shaped cushion strip; (b) the figure is a U-shaped filler strip; (c) the figure shows a claw-shaped backing strip.
FIG. 6 is a graph of PEC criteria for a straight-in-line, shim-type, wound tube heat exchanger of the present invention compared to a conventional wound tube heat exchanger under various operating conditions.
FIG. 7 is a comparison of the deformation of the heat exchange tube of the direct-insert filler strip type wound tube heat exchanger of the present invention and the deformation of the heat exchange tube of the conventional wound tube heat exchanger under various working conditions.
Fig. 8 is a schematic diagram of different arrangement modes of the direct-insert type filler strip of the present invention (taking two layers of heat exchange tube bundles, and four heat exchange tubes in each layer as an example), wherein:
(a1) the heat exchange tube bundle is divided into a plurality of sections along the axial direction of the heat exchanger by taking the screw pitch of a single heat exchange tube as a minimum repeating unit, for each section, a direct-insert backing strip is arranged between every two adjacent heat exchange tubes in the same layer, and all the direct-insert backing strips are aligned and arranged on the same axis;
(a2) the heat exchange tube bundle is divided into a plurality of sections along the axial direction of the heat exchanger by taking the thread pitch of a single heat exchange tube as a minimum repeating unit, for each section, a direct-insert backing strip is arranged between every two adjacent heat exchange tubes in the same layer, and the two adjacent direct-insert backing strips are arranged in a staggered mode;
(a3) the heat exchange tube bundle is divided into a plurality of sections along the axial direction of the heat exchanger by taking the thread pitch of a single heat exchange tube as a minimum repeating unit, for each section, a direct-insert backing strip is arranged between every two adjacent heat exchange tubes in the same layer, and the direct-insert backing strips are arranged in a spiral manner;
(b1) the heat exchange tube bundle is divided into a plurality of sections along the axial direction of the heat exchanger by taking the thread pitch of a single heat exchange tube as a minimum repeating unit, for each section, two straight-inserting cushion strips are arranged between every two adjacent heat exchange tubes in the same layer, and all the straight-inserting cushion strips are divided into two groups and are respectively arranged on two parallel axes in an aligned mode;
(b2) the heat exchange tube bundle is divided into a plurality of sections along the axial direction of the heat exchanger by taking the screw pitch of a single heat exchange tube as a minimum repeating unit, for each section, two straight-inserting cushion strips are arranged between every two adjacent heat exchange tubes in the same layer, and the two straight-inserting cushion strips which are adjacent in the axial direction are arranged in a staggered mode;
(b3) the heat exchange tube bundle is divided into a plurality of sections along the axial direction of the heat exchanger by taking the thread pitch of a single heat exchange tube as a minimum repeating unit, for each section, two straight-inserting cushion strips are arranged between every two adjacent heat exchange tubes in the same layer, and the straight-inserting cushion strips positioned on different layers are arranged in a spiral mode.
FIG. 9 is a graph showing the comprehensive heat exchange performance of the heat exchanger according to the present invention, when three different arrangement modes, i.e., the straight-insertion type shim strips are arranged in an aligned manner, a staggered manner, and a spiral manner.
Fig. 10 is a graph showing the structural stability of the heat exchanger when the in-line type of the present invention is arranged in three different arrangement modes, i.e., aligned arrangement, staggered arrangement, and spiral arrangement.
Fig. 11 is a comparison of a Q-criterion cloud chart of the longitudinal section of the direct-insert type filler strip wound tube heat exchanger of the present invention and a Q-criterion cloud chart of the longitudinal section of the conventional filler strip wound tube heat exchanger, wherein (a) the cloud chart is the Q-criterion cloud chart of the longitudinal section of the conventional filler strip wound tube heat exchanger, and (b) the cloud chart is the Q-criterion cloud chart of the longitudinal section of the direct-insert type filler strip wound tube heat exchanger of the present invention.
Description of reference numerals:
1-outer cylinder of heat exchanger; 2-a core barrel; 3-ith layer of heat exchange tubes; 4-ith +1 layer of heat exchange tubes; 5-direct insertion type filler strip; 51-a first positioning groove; 52-a second positioning groove; 53-a strip-shaped body; 54-spare slots.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
As shown in fig. 1-4, the direct-insert filler strip type wound tube heat exchanger provided by the invention comprises a heat exchanger outer cylinder 1, a core cylinder 2, a plurality of layers of heat exchange tubes and a plurality of direct-insert filler strips 5;
the heat exchange tubes are wound in a staggered manner in a spiral line shape and are arranged in a space between the outer tube 1 and the core tube 2 of the heat exchanger, the spiral directions of two adjacent layers of heat exchange tubes are opposite, the thread pitches of the heat exchange tubes of each layer are the same (or different), and the spiral radius of the outer layer of heat exchange tube is larger than that of the inner layer of heat exchange tube (namely, the spiral radius of the (i + 1) th layer of heat exchange tube 4 is larger than that of the ith layer of heat exchange tube 3);
each layer of heat exchange tube bundle comprises a plurality of heat exchange tubes which are uniformly distributed along the circumference; the pitch, the spiral radius and the spiral direction of the heat exchange tubes positioned on the same layer are the same;
for each layer of heat exchange tube bundle, at least one straight-inserting filler strip 5 is arranged at the gap between two adjacent heat exchange tubes on the same layer, and each straight-inserting filler strip 5 is also respectively positioned in the gap (the gap can be approximately regarded as a diamond-shaped gap) formed by two adjacent heat exchange tubes on different layers; the direct-insert type filler strip 5 is used for controlling the interlayer spacing between the heat exchange tubes of different layers and the tube spacing between the heat exchange tubes on the same layer; when in installation, the direct-insertion filler strip 5 is welded on the wall of the core barrel 2 along the radial direction of the heat exchanger outer barrel 1; preferably, the length direction of the in-line gasket strip 5 is perpendicular to the incoming flow direction.
As shown in fig. 4, for installation convenience, the structural size of the in-line shim strip 5 should be designed and installed according to the rhombic gap formed by the ith layer of heat exchange tube 3 and the (i + 1) th layer of heat exchange tube 4 and the spiral structure of the heat exchange tube, the size of the rhombic gap is determined by the first layer of heat exchange tube, and the calculation formulas of the long diagonal line a and the short diagonal line b of the rhombic gap are as follows:
in the formula, h is the tube spacing between two adjacent heat exchange tubes on the same layer, and R is the spiral radius of the first layer of heat exchange tubes; l is the screw pitch of the first layer of heat exchange tubes; the first layer of heat exchange tubes refers to the layer of heat exchange tubes with the smallest spiral radius in the heat exchanger.
As shown in fig. 5 (a), the direct insert molding strip 5 includes a molding strip body 53, and two rows of positioning grooves are provided on the molding strip body 53 along the width direction thereof; the first row of positioning grooves comprises a plurality of first positioning grooves 51 arranged at intervals along the length direction of the packing strip body 53, the second row of positioning grooves comprises a plurality of second positioning grooves 52 arranged at intervals along the length direction of the packing strip body 53, and the first positioning grooves 51 and the second positioning grooves 52 are alternately arranged (i.e. staggered) in the length direction of the packing strip body 53; the first positioning grooves 51 are respectively used for positioning each odd/even layer of heat exchange tubes, and correspondingly, the second positioning grooves 52 are respectively used for positioning each even/odd layer of heat exchange tubes (in this embodiment, the first layer of heat exchange tube bundle contacts with the second positioning groove 52 corresponding to the mark x in the figure, the second layer of heat exchange tube bundle contacts with the first positioning groove 51 corresponding to the mark y in the figure, the third layer of tube bundle contacts with the second positioning groove 52 corresponding to the mark z in the figure, and the fourth layer of tube bundle contacts with the first positioning groove 51 corresponding to the mark w in the figure, as shown in fig. 5); the first positioning groove 51 and the second positioning groove 52 are both semi-cylindrical in shape and have the diameter equal to the outer diameter d of the corresponding heat exchange tube; in the length direction of the filler strip body 53, the distance s between the adjacent first positioning groove 51 and the second positioning groove 52 is the interlayer distance between the two corresponding layers of heat exchange tubes; the distance h from the bottom of the positioning groove to the bottom surface of the filler strip body 53 is the tube spacing between two adjacent heat exchange tubes in the same layer corresponding to the positioning groove; therefore, the interlayer spacing between the heat exchange tubes of different layers is adjusted through the positioning groove spacing s on the direct-insertion type backing strip 5, and the tube spacing between the heat exchange tubes of the same layer is adjusted through the distance h from the bottom of the positioning groove to the bottom of the backing strip body;
therefore, for the wound tube heat exchanger requiring larger interlayer spacing to reduce flow pressure drop, the distance between the adjacent first positioning groove 51 and second positioning groove 52 in the length direction of the filler strip body 53 only needs to be increased, and the size of the in-line filler strip 5 does not need to be additionally increased;
in order to enable the direct-insert type filler strip 5 to be in surface contact with the heat exchange tube, the first positioning groove 51 and the second positioning groove 52 both have a certain inclination angle θ, θ is an included angle between a tangent of the surface of the positioning groove and the horizontal plane, that is, a spiral angle of the heat exchange tube bundle), and the inclination angle θ is calculated as follows:
the invention can also process a plurality of spare grooves 54 on the filler strip body 53, the spare grooves 54 can be respectively positioned between two adjacent first positioning grooves 51 and two adjacent second positioning grooves 52, and are in symmetrical structures with the first positioning grooves 51 and the second positioning grooves 52; the spare groove 54 has the function of positioning the groove after the spiral direction of the heat exchange tube is changed, so that the direct-insertion gasket 5 can be suitable for heat exchangers with different spiral heat exchange tubes, the universality is better, the processing is more convenient, and the weight is lighter.
The backing strip body 53 shown in fig. 5 (a) is in a straight shape, in other embodiments, the backing strip body 53 may also have other structural forms, specifically, the shape of the backing strip body 53 may be selected according to the heat exchanger load, for example, for a heat exchanger with low load or light weight, a straight shape as shown in fig. 5 (a) or a U-shaped structure as shown in fig. 5 (b) may be selected; for the heat exchanger with larger load or larger weight, a claw-shaped structure (formed by slotting on the filler strip body 53 and cutting off each positioning groove along the length direction of the filler strip body 53 after slotting) shown in a graph (c) in fig. 5 can be selected, so that multiple supporting points can be formed, the heat exchange tube is more stable, the turbulent flow effect is stronger, but the required installation space is larger. Accordingly, as the shape of the filler strip body 53 is changed, the shape of the positioning groove on the filler strip body is also changed adaptively, so as to be matched with the fixed heat exchange tube.
Referring to FIG. 6, the comprehensive heat exchange performance of the straight-insert type filler strip wound tube heat exchanger of the present invention and the conventional filler strip wound tube heat exchanger was comparatively analyzed by means of numerical simulation and based on PEC criterion
As an index for evaluating the comprehensive performance, the Nussel number N and the friction coefficient f are parameters of the traditional wound tube type heat exchanger, N0And f0The parameters of the straight-inserting type filler strip wound tube heat exchanger are shown. The criterion number is more than 1, which indicates that the comprehensive heat exchange performance of the direct-insert gasket type wound tube type heat exchanger is better. As can be seen from fig. 6, the PEC criterion numbers are all greater than 1 in the range of reynolds numbers Re2000 to 14000, and the overall heat exchange performance of the heat exchanger of the present invention can be improved by 5.45% to 11.23% compared to the conventional shim-type wound tube heat exchanger.
Referring to fig. 7, by means of numerical simulation, the structural statics analysis of the direct-insert filler strip type wound tube heat exchanger and the traditional filler strip type wound tube heat exchanger is compared, and the maximum deformation and the average deformation of the heat exchange tube bundle under the combined action of the pressure load and the temperature load can be seen. As can be seen from FIG. 7, compared with the traditional filler strip type wound tube heat exchanger, the straight-insertion filler strip type wound tube heat exchanger has the advantages that the average value of the deformation of the tube bundle is reduced by 44.34-45.19%, the maximum value of the deformation of the tube bundle is reduced by 27.47-29.06%, and the stability is greatly improved.
Fig. 8 shows three different arrangements of the in-line shim strips 5 of the present invention, including an aligned arrangement, a staggered arrangement, and a helical arrangement.
Referring to fig. 9 and fig. 10, the working conditions applicable to the three arrangement modes shown in fig. 8 are compared by using a numerical simulation means, and the comprehensive heat exchange performance of the in-line type gasket strips aligned and arranged is optimal under the working condition of reynolds number of 2000 to 8000; under the working condition that the Reynolds number is 8000-14000, the comprehensive heat exchange performance of the spirally arranged straight-inserting type filler strips is optimal; under the working condition of the Reynolds number of 2000-3000, the structure stability of the straight-inserting type filler strips aligned is optimal; under the condition of the working condition that the Reynolds number is 3000 to 14000, the comprehensive heat exchange performance of the staggered arrangement of the straight-inserting type backing strips is optimal, and the arrangement form of the backing strips can be selected according to the working condition and the expected realization effect.
The flow form of the shell side of the wound tube type heat exchanger is similar to the multi-cylinder turbulent flow motion, and under a certain Reynolds number, the fluid flowing along the surface of the cylinder reaches the cylinderBoundary layer separation occurs near the vertex, and vortices periodically and alternately fall off from the upper side and the lower side of the rear edge of the separated fluid cylinder to form a regularly arranged vortex array, namely a karman vortex street. A cloud picture of a longitudinal section Q rule vertical to the direction of the direct-insert type backing strip is shown in figure 11, wherein ellipses at two sides are tube bundle sections, and a rectangle and a circle in the middle are respectively the cross sections of a traditional backing strip and the direct-insert type backing strip. The Q criterion is a vortex discrimination criterion, and a region defined as a second matrix invariant of a velocity gradient tensor in the flow field and having a positive value is a vortex. For the conventional structure, the vortex formed by boundary layer separation when the shell side fluid flows across the upstream tube bundle is attached to the incident flow surface of the downstream tube wall and reattached, and the average vorticity size of the reference surface is 101.89s under the conventional structure-1Maximum vorticity value of 131281.91s-1(ii) a The straight-inserting type backing strip can be used as a vortex generator while fixing the position of the tube bundle, and in (b) in fig. 11, the straight-inserting type backing strip can be seen to obviously influence a wake field of the tube bundle, so that the turbulence degree around the tube bundle is increased, high momentum fluid outside a boundary layer is brought into the boundary layer, and a generated longitudinal vortex generates continuous disturbance to the boundary layer along the main flow direction, the heat exchange performance of shell side fluid is enhanced, and the average vortex value of a reference section is 128.68s-1Maximum vorticity value of 143710.22s-1Compared with the traditional structure, the structure is respectively improved by 8.30 percent and 9.47 percent. And just produce periodic swirl and drop in heat exchange tube bank low reaches when 0.0045 seconds under traditional structure, the swirl drops and can arouse the tube bank to take place vortex-induced resonance, influences the stable in structure performance of heat exchanger, and the swirl drop cycle obviously increases after adding the formula filler strip that cut straightly for the structure of heat exchanger is more stable.
Claims (8)
1. The direct-insert filler strip type wound tube heat exchanger comprises a heat exchanger outer cylinder (1), a core cylinder (2), a plurality of layers of heat exchange tubes and a plurality of filler strips;
the heat exchange tubes are wound in a staggered manner in a spiral line shape and are arranged in a space between the outer tube (1) and the core tube (2) of the heat exchanger, the spiral directions of two adjacent layers of heat exchange tubes are opposite, and the spiral radius of the outer layer of heat exchange tube is larger than that of the inner layer of heat exchange tube;
each layer of heat exchange tube bundle comprises a plurality of heat exchange tubes which are uniformly distributed along the circumference; the pitch, the spiral radius and the spiral direction of the heat exchange tubes positioned on the same layer are the same;
the method is characterized in that:
the filler strip is a direct-insert filler strip (5) and is radially arranged on the core cylinder of the wound tube type heat exchanger, and at least one direct-insert filler strip (5) is arranged in a gap between every two adjacent heat exchange tubes of each layer of heat exchange tube bundle; the direct-insert type filler strip (5) is used for controlling the layer spacing between the heat exchange tubes of different layers and the tube spacing between the heat exchange tubes of the same layer;
the direct-insertion type gasket strip (5) comprises a gasket strip body (53), and two rows of positioning grooves are formed in the gasket strip body (53) along the width direction of the gasket strip body;
the first row of positioning grooves comprise a plurality of first positioning grooves (51) which are arranged at intervals along the length direction of the packing strip body (53), and the second row of positioning grooves comprise a plurality of second positioning grooves (52) which are arranged at intervals along the length direction of the packing strip body (53);
the plurality of first positioning grooves (51) and the plurality of second positioning grooves (52) are arranged in a staggered mode, the plurality of first positioning grooves (51) are used for positioning the odd/even layers of heat exchange tubes respectively, and the plurality of second positioning grooves (52) are used for positioning the even/odd layers of heat exchange tubes respectively;
the shapes and the sizes of the first positioning groove (51) and the second positioning groove (52) are matched with the heat exchange tubes supported by the first positioning groove and the second positioning groove;
in the length direction of the filler strip body (53), the distance between the adjacent first positioning grooves (51) and the second positioning grooves (52) is the interlayer distance between the two corresponding layers of heat exchange tubes; the distance from the bottom of each positioning groove to the bottom surface of the filler strip body (53) is the tube space between two adjacent heat exchange tubes in the same layer corresponding to the positioning groove.
2. The direct inset padtype wound tube heat exchanger of claim 1, wherein: the length direction of the straight-inserting type filler strip (5) is vertical to the incoming flow direction.
3. The direct inset padtype wound tube heat exchanger of claim 2, wherein:
the first positioning groove (51) and the second positioning groove (52) both have a certain inclination angle theta, so that the first positioning groove and the second positioning groove are in surface contact with each other; the tilt angle θ is calculated according to the following formula:
wherein R is the spiral radius of the first layer of heat exchange tubes; l is the screw pitch of the first layer of heat exchange tubes; the first layer of heat exchange tubes refers to the layer of heat exchange tubes with the smallest spiral radius in the heat exchanger.
4. The direct inset padtype wound tube heat exchanger of claim 3, wherein: the filler strip body (53) is in a straight shape, a U shape or a claw shape.
5. The direct inset padtype wound tube heat exchanger of claim 4, wherein: a plurality of spare grooves (54) are also arranged on the filler strip body (53).
6. The direct strip wound tube heat exchanger of any of claims 1-5, wherein: the direct-insertion filler strips between every two adjacent heat exchange tubes in the same layer are arranged in an aligned mode.
7. The direct strip wound tube heat exchanger of any of claims 1-5, wherein: the direct-insertion filler strips between every two adjacent heat exchange tubes in the same layer are arranged in a staggered mode.
8. The direct strip wound tube heat exchanger of any of claims 1-5, wherein: the straight-inserting filler strips between every two adjacent heat exchange tubes in the same layer are spirally arranged.
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| CN202011565261.XA CN112665419B (en) | 2020-12-25 | 2020-12-25 | Direct-insertion filler strip type wound tube heat exchanger |
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| CN113483584B (en) * | 2021-07-16 | 2023-03-14 | 中石化宁波工程有限公司 | Pipe distribution method of U-shaped pipe type heat exchanger |
| CN115031423B (en) * | 2022-06-10 | 2023-04-11 | 浙江青风环境股份有限公司 | Water chilling unit with vortex disc type micro-channel heat exchanger |
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