Method of manufacture of double-walled heat exchange pipe with possibility of detection of leakage and design of such pipe

FIELD: heat power engineering.

SUBSTANCE: according to proposed method, inner pipe is fitted into outer pipe after shape-treatment of at least outer surface of inner pipe or inner surface of outer pipe, and after fitting inner pipe outer pipe, inner pipe is expanded to bring outer surface of inner pipe in tight contact with inner surface of outer pipe, and shape-treatment of surface forms at least one channel to reveal leakage between two pipes. Before fitting in pipes at least outer surface of inner pipe or inner surface of outer pipe is coated with layer of solder, for instance, tin, and inner pipe is expanded so that outer pipe also expands, and solder layer between inner and outer pipes is melted. Outer pipe is expanded so that melted layer of solder is forced out from space between inner and outer pipe at least intone channel to reveal leakage. Such heat exchange pipe contains assembly unit consisting of outer pipe and inner pipe fitted at tight contact in between and at least one channel to reveal leakage passing in contact surface and near the surface between inner and outer pipes. Thin film-like layer of solar material, such as tin, is provided in place of contact between inner and outer pipes which, owing to melting, connects with inner pipe and outer pipe, inner and outer pipes adjoining with displacement. Invention makes it possible to increase heat transfer to value equal to or practically equal to that of solid heat exchange pipe and channel to reveal leakage remains free from filling medium, thus providing accurate and reliable revealing of leakage.

EFFECT: improved reliability.

15 cl, 6 dwg

 

The present invention relates to a method of manufacturing a heat transfer tube double-walled with leak detection, in which the inner tube is inserted in the outer pipe after executing the profiling surface, at least on the outer surface of inner tube or on the inner surface of the outer tube, and, after the inner and outer tubes inserted into each other, the inner pipe is expanded so that the outer surface of the inner tube comes into tight contact with the inner surface of the outer tube, and profiling the surface forms at least one channel to detect leaks between the two pipes.

This method is known from DE-a-30 00 665. In this way provide a surface profiling on the outer surface of the inner pipe in the form of sizebreast with numerous sharp, pirimidinovyye or conical protrusions. In order to obtain the necessary heat transfer, after the expansion of the inner pipe inserted in the outer pipe, the top of many of the projections are pressed against the inner wall of the outer tube. Although the result of such pressure, the amount of surface contact between the inner and outer pipes is the same order as that of the untreated surface of contact, the resulting heat transfer than the s with integral heat pipe without detection of the leak, can be classified as poor, while the heat transfer, in addition, is deteriorating as a result of prolonged use of heat pipes.

In order to obtain improved heat transfer in DE-C-3706408, it is proposed to fill up the channel for detection of leakage of the heat transfer fluid. As you can see from the chart tests, although as a result of this heat transfer is improved, it is still significantly lower heat transfer solid heat exchange tubes without detection of the leak. In addition, this known composite heat pipe must meet specific conditions in order to support the detection of the leak. The channel for detection of the leak must be in the form of a capillary channel, and the heat transfer liquid should have a boiling point which is above the maximum operating temperature of heat exchanger pipe. Only then due to capillary action, the liquid will not flow out of the channel for detection of the leak, but will be pushed out of it in case of a leak and, thereby, to indicate the presence of a leak. This is not only a complex system that imposes special requirements, but, in addition, it requires control in which the expansion of the heat transfer fluid when it is heated during use of the heat exchange tubes, creates a situation easily privateyou to the solution the WMD assumption, that is to flow when the liquid (due to expansion) is displaced from the capillary channel for detection of the leak.

Further, in GB-A-822.705 described heat pipe consists of three parts: the outer tube, inner tube and screw gasket provided between the pipes and primavesi as to the inner pipe and the outer pipe. This design first performed by inserting three parts to each other with a layer of solder provided between every two parts. Then the inner tube to expand or compress the outer pipe forming a mechanical connection between the elements of the Assembly consisting of the outer tube, the helical strip and the inner tube, with mechanical joint Supplement soldered connection, subjecting the Assembly to heat treatment during or after surgery deformation. This soldered connection has the advantage of being relatively non-soldered connection that at the transition between the pipe and the gasket can be made better, i.e. more complete connection. On the other hand, however, due to the use of the three parts of the design becomes more complex: the parts when they are inserted into each other, have less accurate relative to each other due to the presence of a screw, a flexible strip, which leads to the channel for detection is of the leak, having an uneven cross-section along its length; the deformation of one of the pipes shall be implemented by the introduction between them of the screw, flexible, single strip, which leads to a mechanical connection, which is less controlled and less certain; and last, but not least, there are two transition areas formed by the solder that adversely affect the heat transfer, since the solder, such as tin, always has a lower heat transfer coefficient than the material, such as copper, parts that require connection.

The objective of the invention is to increase heat transfer to the value equal to or essentially equal to the integral heat pipe, at the same time, the channel for detection of the leak remains free from filling and thus performs its function accurately and reliably.

In accordance with the invention, in the method of manufacturing a heat transfer tube double-walled with leak detection inner pipe inserted in the outer pipe after profiling the surface at least on the outer surface of inner tube or on the inner surface of the outer tube after the inner and outer tubes inserted into each other, the inner tube extends so that the outer surface of the inner tube comes into tight contact with the inner surface externally the second pipe, and profiling the surface forms at least one channel to detect leaks between the two tubes, while prior to inserting the inner and outer pipes into each other at least the external surface of the inner tube or the inner surface of the outer tube provide with a layer of solder material, such as tin, expansion of the inner pipe is carried out so that the outer tube is also expanding, and carry out the melting layer of solder material between the inner and outer tubes, the extension of the outer tube carried out so that a layer of molten solder largely squeezed out of the gap between the inner pipe and the outer pipe at least one channel to detect the leak.

Optimal contact between the inner and outer pipes reach and support as a result of these characteristics during the use of the tubes.

As a result of expansion of the outer tube through the inner tubes achieve the effect that compression of the inner pipe due to the lower temperature heat exchange medium passing through it, the inner pipe in the elastic recovery after deformation always maintains the shape of the inner tube, so always maintain tight contact between the inner and outer pipes.

Execute podderjanie this close contact also undertaken and supported by the soldering of the inner pipe and the outer pipe between them. Long-term tests have shown that, for example, in the case of contact of the copper/copper without connecting layer heat transfer largely depends on the properties adjacent copper surfaces, characteristics of the exposure (air bubbles) and the pressure in the junction. Heat transfer can be significantly reduced over time. It is assumed that this is caused by oxidation of the adjacent surface layers, partly as a result of the relative movement of the surfaces due to temperature changes during use of the heat exchange tubes. In the connection of the contacting surfaces with a layer of solder, such as tin, this effect of reduction of heat transfer over time, as it was discovered, more is not shown.

Tin has a lower heat transfer coefficient than copper. It would seem that the creation of a layer of tin between two adjacent copper surfaces creates an adverse effect on heat transfer. When using the method according to the invention, however, receive a heat pipe having a heat transfer, which is barely if at all noticeable, different from the heat transfer solid copper pipe. This surprising effect, apparently, is the result of pressure generated between the inner and outer tubes in the expansion Assembly of these tubes. the rich pressure there is, when the melting layer of tin all the excess tin is forced into the channel for detection of the leak, leaving only a very thin film of tin, which, moreover, is fused with the adjacent copper surfaces. Thus optimally supported contact copper/copper, and (connecting and filling) tin ensures that not happening mutual separation in the relative displacement, and therefore, no oxidation, resulting in optimal heat transfer does not decrease with time when using the tubes.

This effect is partly the result of using only two tubes which are inserted one into the other, and each of which individually is relatively hard. When the enlargement of the inner tube outer tube expands, there is such a high surface pressure in the contact zone between these pipes that during the heating Assembly, a layer of solder present between the outer pipe and the inner pipe is squeezed out almost completely, thereby creating a contact copper/copper. When the Assembly consists of three or more parts, during expansion of the first part of surface pressure between the second and third parts will be less due to “free” the second part, as this part if it is yet the helical structure, can also be deformed in the axial direction. Partly because of the fact that the transition can be determined less accurately, as described above, this can lead to insufficient extruded layer of solder, if any, was squeezing, and, consequently, to reduced heat transfer. Since the heat transfer depends on the weakest link in the chain, if the heat transfer between the second and third parts of the lower heat transfer of the whole structure less than the possible heat transfer between the first and second parts. Thus, the two-element design has significant advantages in accurate reproducibility, it is always optimal heat transfer, which, as stated above, is not significantly different from the heat transfer one-piece heat exchanger tube, and simple fabrication.

In order to ensure the possibility of the outer tube to optimally take the form of an inner tube, when the latter is cooled, preferably in accordance with another variant implementation of the invention, to perform the inner tube of a softer material than the outer tube. Thanks to this characteristic strength elastic recovery after deformation in the more solid the outer tube will be greater than in the softer inner core tube as the outer tube in each case will be more prone to elastic recovery than the inner pipe, and tightly imikay contact between the inner and outer tubes in each case optimally installed and maintained, and always guaranteed the best extrusion to the extent necessary layer of molten solder.

Profiling the surface for formation of the channel for detection of the leak can be performed in various ways. In accordance with another variant implementation of the invention, however, it is preferable that the surface profiling was performed so that the surface profiling, measured on the corresponding surface of the corresponding pipe, took at most about 50% of this surface. Comprehensive measurements during tests showed that then can be implemented heat pipe with double walls, which has optimum properties for the detection of leakage and heat transfer, which is barely if at all noticeable, is different from the solid heat transfer pipe.

In accordance with very strict government requirements in force in the Netherlands, the channel for detection of the leak must be designed so that, if you drill through hole with a diameter of 2 mm in a responsible part of the heat exchange tubes and to both sides of the pipe to make a water pressure of 50 kPa, liquid leakage arising out of the channel for detection of the leak must be found within 300 C. This requirement may be fulfilled with a heat exchange tube according to the invention, and without loss of heat transfer in the CPA is to the one-piece heat exchanger tube, if, in accordance with another variant implementation, the surface profiling is provided in the form of a helical groove width of about 2 mm and a pitch of about 4 mm

Heating the Assembly of the outer tube and inner tube for melting solder layer may be preferably carried out by means of additional heat treatment performed on the heat exchanger tube, for example, during heating to prepaymania ripoarisch elements at least to the outer surface of the outer tube or the inner surface of the inner tube, such as a wire spiral, spiral wound on the pipe.

The solder layer may be provided on the inner or on the outer tube, or both, regardless of the presence and time of the profiling surface for formation of the channel for detection of the leak. According to the invention, preferably, on the outer surface of the inner tube covered with a layer of solder material, later on it was created profile the surface in the form of at least one screw passing grooves. If you prefer to create a profiled surface on the inner surface of the outer tube, for example by extrusion, then preferably the outer surface of the inner pipe run with a layer of solder material, the inner surface of the outer tube to provide a surface profiling in the form of longitudinally passing grooves.

Depending on the application it is necessary to pay special attention to the ends of the tubes to prevent the separation of the two pipes, starting from the end. In this case it is necessary to provide for the welding of silver on each end of the Assembly of inner and outer tubes along the seam between the inner and outer pipes.

Alternative or additionally, it is also possible that at least one of the ends of the Assembly of inner and outer tubes, at least the inner surface of the inner tube or the outer surface of the outer tube were provided with an insulating lacquer. Thus, the end of the pipe is protected from excessive thermal shock at the sudden temperature change of the heat exchange medium passing through it, for example, this may occur in Central heating systems.

The invention also relates to the heat transfer pipe with leak detection, containing Assembly consisting of an outer tube and an inner tube with a tight abutting contact between them, and at least one channel to detect leakage passing through the contact surface near or between the inner and outer pipes. In order to realize optimal heat transfer in this heat exchanger pipe, and to maintain this optimal talpirid the Chu over time when using, it is necessary that the contact between the inner and outer tubes attended a thin film layer of a solder material such as tin, which is connected to the inner pipe and outer pipe by means of welding, and the inner pipe and the outer pipe adjacent to each other with an offset, so that the thin film layer may be porous, i.e. locally interrupted.

In order to perform the channel for detection of the leak optimally available and current without a significant impact on the ends of the tubes, it is necessary in accordance with another variant implementation of the invention near the end of the Assembly of inner and outer tubes through the hole in the outer tube, and this through hole is in communication with the channel for detection of the leak or each of them is provided in the Assembly node.

Possible additional protection ends from heat stroke when at least one of the ends of the Assembly of inner and outer tubes, at least the inner surface of the inner tube or the outer surface of the outer tube is provided with an insulating lacquer. If for increased heat transfer capability zebroobraznyj elements, such as a wire spiral, spiral wound pipe, soldered at m the d to the outer surface of the outer tube or the inner surface of the inner pipe, it may be preferable to exclude these zebroobraznyj elements along the length of the lacquer coating.

With reference to the exemplary embodiments of execution represented in the drawings, the following only as an example according to the invention additionally describes a method and a heat pipe.

Figure 1 shows a vertical projection of the first Assembly of the inner tube and the outer tube partially inserted into each other, with a partial section of the inner pipe;

figure 2 shows a cross section along the line II-II in figure 1;

figure 3 shows a cross section corresponding to figure 2, the completed heat exchanger tubes;

figure 4 shows a vertical projection of the second Assembly inner tube and the outer tube partially inserted into each other, with a partial section of the inner pipe and the outer pipe;

figure 5 shows a half cross-section along the line V-V in figure 4;

figure 6 shows a third variant of the tubes.

Figure 1 shows the inner pipe 1, partially inserted in the outer pipe 2. The inner tube 1 made of a smooth copper pipe, the outer surface of which is first coated with a thin layer of tin 3, and then perform four spaced at equal intervals, spiral passing grooves 4 on the tin-plated surface. The outer tube 2 consists of smooth is th copper pipe, the internal diameter of which is somewhat larger outer diameter of the layer of tin on the inner pipe 1.

After the inner tube 1 is fully inserted in the outer pipe 2, the thus obtained Assembly is subjected to the operation of deformation, whereby the inner tube 1, if you want more than one step using a mandrel for rolling expand and plastically deform so that the layer of tin is in tight abutment with the inner surface of the outer tube. In order for this junction were also preserved during compression of the inner pipe 1 due to the reduction temperature, the expansion of the inner tube 1 continue until such time as also will not be expanded outer tube 2 in such a way that creates elastic displacement in the outer tube 2, which ensures that the outer tube 2 continues to maintain the shape of the inner tube 1 when it is compacted.

After this operation, the expansion Assembly is heated to a temperature at which the tin layer 3 begins to melt. Partly due to the elastic displacement in the outer tube 2 molten tin begins to flow and, thereby, on the one hand, to be alloyed with copper two adjacent surfaces of the pipes, and, on the other hand, be squeezed out from between the two copper surfaces in the grooves 4. After heat treatment, the two copper p is the surface spaivayut together that tin completes and complements the two copper surfaces so that they are actually together without gaps. As a result, although the two copper surfaces joined together by a layer of tin, the tin layer at the same time has been reduced by an offset in the outer tube to a very thin porous films. This, in turn, leads to the fact that, despite the fact that the tin has a lower heat transfer coefficient than copper, the heat transfer Assembly of pipes is hardly, if at all, much less heat compared to a solid copper pipe, even if the surface of the groove is so large that the surface of the remaining ribs.

The connection together of the two surfaces through the tin leads to the fact that during thermal motion of the compression or expansion does not offset the two surfaces. This, and the fact that by filling the tin of any small irregularities between the two surfaces and extrusion of excess tin in grooves eliminate any air bubbles, preventing the formation of oxide on the copper surfaces and, in particular, inside a slowly progressive oxidation of the copper surfaces at both ends (separation due to the effect of memorization). Since the formation of oxide has a very adverse effect on the heat transfer, Tenaglia heat transfer compound heat transfer tube in accordance with the invention, which, as indicated, compared with the solid copper heat transfer pipe is supported in a period of time during use.

Figure 2 shows a subassembly of the inner pipe 1 and outer pipe 2 before expansion operation, and figure 3 shows the Assembly after the heat treatment, i.e. in the completed state. Figure 3 does not show the layer of tin, reduced to a very thin non-porous film, but shows the excess tin, pressed into the grooves 4 in the form of solidified droplets 3'. Figure 3 also shows that the pipes were expanded compared to option 2, i.e. the diameters of all pipes is increased, at the same time, the outer diameter of the inner pipe 1 has become equal to the inner diameter of the outer tube 2.

It should be noted that the various dimensions are not shown to scale, that is in particular true for the tin layer 3. Below, purely as an example of how you can get a composite heat exchange tube having an external diameter of 28.3 mm and an inner diameter of 23 mm

The starting point is the inner tube of copper, medium-hard, having an external diameter of 25 mm and an inner diameter of 22 mm and an outer tube made of solid copper with an outside diameter of 28 mm and an inner diameter of 25.6 mm After the pipes were inserted one into the other and expanded in two stages, was obtained a composite heat exchange tube which acts as a one-piece heat exchanger tube, having an external diameter of 28.3 mm and an inner diameter of 23 mm, and the transition (tin film) between the inner and outer tubes are located on a diameter of 26 mm, the Total thickness of the considered walls decreased from 2.7 mm to 2,65 mm Is the result of cold deformation (expansion), whereby the composite tube is somewhat longer. These dimensions were chosen after it was determined through testing that with such a degree of expansion of the elastic recovery after deformation of the outer tube is enough for external pipe kept the form of the inner pipe at its sudden compression of the sudden change in temperature from 100°to 10°without the need to reduce its temperature. The choice of material (copper, the average hardness for the inner tube and solid copper for the outer tube) provides the desired effect of elastic recovery after deformation, as softer materials less recover after deformation, the more solid materials.

In an exemplary embodiment, the figs.4 and 5 copper inner pipe 11 provided with a layer of tin 13, was inserted in the outer pipe 12, the internal surface of which consists of fifteen grooves 14, obtained, for example, by extrusion, passing in the longitudinal direction of the pipe. Option, which shows two pipes, the identity is n depicted in figure 1, that is, after the pipe is fully inserted one into the other, were expanding to such an extent that described above, and then by heat treatment ensure the melting of the tin layer 13, resulting squeeze out the excess tin in places of longitudinal ridges on the outer surface of the inner tube 11, forming a residual filling and connecting the tin film in the longitudinal grooves 14 to form a channel for detection of the leak, thereby creating a composite heat pipe with leak detection, acting as a one-piece heat exchanger tube and having a configuration comparable to that shown in figure 3.

Figure 6 shows the heat exchanger tube containing an inner tube 21 and outer tube 22 closely adjacent to each other and United by a film of tin, as described above. At the transition between the two pipes 21, 22 has one spiral groove 24 on the outer surface of the inner pipe 21, with this groove forms a channel for detection of the leak. Such a channel for detection of the leak is intended for those cases where the heat environment should never come into contact with heat-absorbing medium. If a crack forms in the inner or the outer tube, the medium flowing through it, will be stopped in the channel for detection of the leak. To the mouth of the o be catching the presence of fluid in the channel for detection of the leak, he must be sensitive to it. Therefore, the slot 25 in the outer tube 22, while the hole is in open contact with the channel for detection of the leak. The hole 25 may be in communication with a means for detection of the leak detecting an environment that follows, or the pressure change.

As mentioned, the separation of the composite heat pipe is very disadvantageous for heat transfer, and described how to prevent such separation in the heat exchange tubes. Another protective measure in this respect may be the creation of a weld 26 silver (see Fig.6) at the transition between the inner tube 21 and outer tube 22 at least at one end of the composite heat pipe. In addition, hardening or instead may also be provided, to consider the end less subjected to thermal shock, creating an insulating lacquer coating 27 (see Fig.6).

In order to increase the heat transfer may be provided with ribs or ridges on the outer surface of the outer tube 22 or the inner surface of the inner tube 21. Such ribs or ridges may be made by extrusion. Another possibility is the creation of a spirally wound wire 28 (for example, with a trapezoidal profile winding; see Fig.6), which then Wintour is but is wound on the outer pipe 22. The connection of this wire with the pipe shall be implemented by soldering. This heat treatment can also serve as to melt a layer of tin between the inner pipe and the outer pipe to form a composite heat exchange tube acting as a single element.

In an embodiment in accordance with 6 inner tube similarly equipped zebroobraznyj elements in the form of a spirally wound wire 29, spiral wound and fixed on the support pipe 30, is inserted into the inner concentric pipe 21. If required, the inner surface of the inner tube 21 may be coated with tin, so that during heat treatment the ends of the wound wire 29, remote from the support pipe 30, is attached to the inner surface of the inner tube 21.

It is clear that within the scope of the invention set forth in appended claims, various modifications and variations. Thus, during the formation of the channel for detection of a leak in the above embodiments, the execution grooves provide on the inner surface of the outer tube or on the outer surface of the inner pipe. Of course, the grooves can also be provided on both surfaces, or different grooves can be interconnected with other grooves, creating a surface with more or less p is plenium. In addition, copper and tin is specified as the materials used, however, this does not preclude the use of other materials. In some cases, you can eliminate the heat treatment for melting and partial extrusion of a layer of tin, for example, when the expansion is accompanied by heat, so that the material of the solder already melted during expansion.

1. A method of manufacturing a heat transfer tube double-walled with leak detection, in which the inner tube is inserted in the outer pipe after profiling the surface, at least on the outer surface of inner tube or on the inner surface of the outer tube after the inner and outer tubes inserted into each other, the inner tube extends so that the outer surface of the inner tube comes into tight contact with the inner surface of the outer tube, and profiling the surface forms at least one channel to detect leaks between the two pipes, wherein prior to inserting the inner and outer pipes each other, at least the external surface of the inner tube or the inner surface of the outer tube provided with a layer of solder material such as tin, carry out the expansion of the inner tube so that the outer tube is also expanding, and carry out the melting layer of solder material is between the inner and outer pipes, the extension of the outer tube carried out so that the molten solder layer largely squeezed out of the gap between the inner pipe and the outer pipe, at least one channel to detect the leak.

2. The method according to claim 1, characterized in that the inner tube is made of a softer material than the outer pipe.

3. The method according to any one of claims 1 and 2, characterized in that the surface profiling carried out so that the surface profiling, measured on the corresponding surface of the corresponding pipe, is at most approximately 50% of this surface.

4. The method according to claim 3, characterized in that the surface profiling is performed in the form of a helical groove having a width of about 2 mm and pitch of about 4 mm

5. The method according to any of the preceding paragraphs, characterized in that the heating provide the result of prepaymania, at least on the outer surface of the outer tube or the inner surface of the inner tube ripoarisch elements, such as a wire spiral, spiral wound on the pipe.

6. The method according to any one of claims 1 to 5, characterized in that the outer surface of the inner tube is covered with a layer of solder material, and then it performs the profiling surface in the form of at least one screw passing Kanak is.

7. The method according to any one of claims 1 to 5, characterized in that the outer surface of the inner pipe is provided with a layer of solder material, and on the inner surface of the outer tube perform profiling of the surface in the form of longitudinally passing grooves.

8. The method according to any of the preceding paragraphs, characterized in that at each end of the Assembly of inner and outer tubes provide for the welding of silver along the seam between the inner and outer pipes.

9. The method according to any of the preceding paragraphs, characterized in that at least at one end of the Assembly of inner and outer tubes, at least on the inner surface of the inner tube or on the outer surface of the outer tube provide an insulating varnish.

10. Heat pipe with leak detection, containing Assembly consisting of an outer tube and an inner tube in tight abutting contact between them and at least one channel to detect leakage taking place in the contact surface and next to it between the inner and outer pipes, characterized in that the contact between the inner and outer tubes are made of thin plenkoobrazovatel layer of solder material such as tin, which by melting connects with the inner tube and the outer tube and the inner tube and outside the tube are adjacent to each other with an offset.

11. Heat pipe of claim 10, characterized in that near the end of the Assembly of inner and outer tubes are formed of a through hole in the outer tube, which is in communication with the channel for detection of the leak or each channel to detect the leak provided in the Assembly node.

12. Heat exchanger tube according to any one of p and 11, characterized in that at least at one end of the Assembly of inner and outer tubes, at least on the inner surface of the inner tube or on the outer surface of the outer tube is provided with insulating varnish.

13. Heat exchanger tube according to any one of p-12, characterized in that, at least on the outer surface of the outer tube or the inner surface of the inner tube soldered zebroobraznyj elements, such as a wire spiral, spiral wound on the pipe.

14. Heat exchanger tube according to any one of p-12, characterized in that, at least on the outer surface of the outer tube or the inner surface of the inner tube soldered zebroobraznyj elements, such as a wire spiral, spiral wound pipe, and such zebroobraznyj items excluded by the length of the lacquer coating.

15. Heat exchanger tube according to any one of p-12, characterized in that the profile p of the surface, measured on the corresponding surface of the corresponding pipe, is at most about 50% of this surface.

16. Heat exchanger tube according to item 15, wherein the surface profiling is a helical groove having a width of about 2 mm and pitch of about 4 mm



 

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The heat exchanger // 2141614

FIELD: heat power engineering.

SUBSTANCE: according to proposed method, inner pipe is fitted into outer pipe after shape-treatment of at least outer surface of inner pipe or inner surface of outer pipe, and after fitting inner pipe outer pipe, inner pipe is expanded to bring outer surface of inner pipe in tight contact with inner surface of outer pipe, and shape-treatment of surface forms at least one channel to reveal leakage between two pipes. Before fitting in pipes at least outer surface of inner pipe or inner surface of outer pipe is coated with layer of solder, for instance, tin, and inner pipe is expanded so that outer pipe also expands, and solder layer between inner and outer pipes is melted. Outer pipe is expanded so that melted layer of solder is forced out from space between inner and outer pipe at least intone channel to reveal leakage. Such heat exchange pipe contains assembly unit consisting of outer pipe and inner pipe fitted at tight contact in between and at least one channel to reveal leakage passing in contact surface and near the surface between inner and outer pipes. Thin film-like layer of solar material, such as tin, is provided in place of contact between inner and outer pipes which, owing to melting, connects with inner pipe and outer pipe, inner and outer pipes adjoining with displacement. Invention makes it possible to increase heat transfer to value equal to or practically equal to that of solid heat exchange pipe and channel to reveal leakage remains free from filling medium, thus providing accurate and reliable revealing of leakage.

EFFECT: improved reliability.

15 cl, 6 dwg

FIELD: baking industry.

SUBSTANCE: proposed plant includes trap hood and heat exchange cooling unit connected with it and mounted under it; cooling unit includes jacket with pipe line located over its center. Heat exchange cooling unit is used for forced circulation of cold air between jacket and pipe line inside it directing the flow in required direction: in cold season outside air is delivered and at hot season air from floor areas is delivered.

EFFECT: simplified construction; enhanced ecology; saving of water.

1 dwg

FIELD: heat-exchange apparatus.

SUBSTANCE: air cooler comprises vortex heat exchangers, pipes of the vortex heat exchangers for flowing air to be cooled flows, swirlers, and actuator of purifying mechanisms. The actuator has hollow driving shaft mounted in the pipes and provided with a longitudinal groove throughout its length. The groove receives unmovable screw with a nut coupled with the bushing freely mounted on the shaft through a key. The brush holder with brushes are secured to the bushing. The outer side of the pipes of the vortex heat exchangers are provided with chutes for circulating a coolant. The vortex heat exchangers has a fining with a coefficient that varies according to the relationship where D is the diameter of the pipe, n is the number of chutes, and l is the chute width. The parameters vary in the following range: D = 50-800 mm and l = 20-50 mm. The chute height l1 =3-40 mm, the thickness of the pipe wall and the thickness of the chute wall

EFFECT: simplified structure and enhanced reliability.

5 cl, 7 dwg

FIELD: heat exchange.

SUBSTANCE: heat exchanger comprises housing with front and back supporting lags of different height, lens compensator, pipe bundle with branch pipes for supplying and discharging heat-transfer agent, and front water chamber with the baffle which divides the pipe bundle into two sections. One of the sections is provided with branch pipes for supplying and discharging fluid to be heated, and the other section defines the back water chamber. The lens compensator is mounted in the vicinity of the back water chamber, and back supporting lag of the housing is provided with the additional supporting unit and mounted on the housing upstream or downstream of the lens compensator.

EFFECT: improved heat exchange and enhanced reliability.

1 dwg

FIELD: heat exchange apparatus.

SUBSTANCE: surface heat exchanger comprises casing provided with bearing lags, lens compensator, pipe bench with branch pipes for supplying and discharging heat-transfer agent, and front water chamber with the baffle that divides it into two sections. One of the sections is provided with the branch pipes for supplying and discharging of the fluid to be heated, and the other section defines the back water chamber. The pipe bench inside the housing is separated by the horizontal baffle provided with the by-pass port interposed between the lens compensator and back water chamber. The top and bottom sections of the pipe bench are separated with the vertical baffles arranged symmetrically to each other.

EFFECT: improved heat exchange and enhanced heat power and reliability.

1 dwg

FIELD: methods of treatment of fluocarbon raw.

SUBSTANCE: the invention is pertaining to the methods of treatment of fluocarbon raw. The method of treatment of fluocarbon raw provides for heating by means of high frequency induction of a heating zone of a reaction chamber up to the temperature of no more than 950°C, heating in the heating zone of fluocarbon raw, which contains at least one fluocarbon compound, so, that the fluocarbon compound dissociates with production of at least one predecessor of fluocarbon or its reactive kinds; and refrigerating of the predecessor of fluocarbon or its reactive kinds, in the result of which from the predecessor of fluocarbon or its reactive kinds forms at least one more desirable fluocarbon compound. The technical result is conversion of the fluocarbon raw into the useful products by the low-cost reliable non-polluting environment universal and easily controlled method.

EFFECT: the invention ensures conversion of the fluocarbon raw into the useful products by the low-cost reliable non-polluting environment universal and easily controlled method.

12 cl, 10 dwg, 3 tbl, 2 ex

Heat exchanger // 2269080

FIELD: heat engineering, applicable in heat exchanging apparatus with recuperative heat transfer in various branches of industry.

SUBSTANCE: the heat exchanger has a body with pipe-branches for feeding and discharging the working media and ducts for the heat transfer agents formed by the ribs adjoining the body shell, the body is made in the form of a cylindrical shell enclosing the heat exchange surface made as a double screw thread with formation of two screw ducts of the same section separated by a wall serving as a rib of the heat exchange surface, feed and removal of heat-transfer agents are accomplished by means of manifolds, in which partitions are installed for separation of the flows of heat-transfer agents, besides, the roughness of the heat exchange surface makes it possible to use viscous heat-transfer agents, and at feeding of heat-transfer agents to the screw ducts separation of the heat-transfer agents is not required.

EFFECT: enhanced operating reliability and intensification of heat exchange.

FIELD: heating.

SUBSTANCE: apparatus can be used in steam and liquid cooling systems. The heat exchange apparatus consists of external and internal pipes, installed at an angle of 0-85° to the horizontal and arranged concentrically relative each other, each of which is equipped with sockets for input and output of the heat carrier. The internal pipe is divided into sections, made with the provision for interconnection of the sections through overflow openings, made in the form of segmented apertures in the intersection partition walls, installed with alternation of these openings upwards and downwards, and made in the form of segmented diaphragm. The segmented openings are formed in the space between the wall of the internal pipe and the diaphragm, and the overflow thresholds of the partition walls are parallel to each other and relative the horizontal.

EFFECT: simple structure.

1 dwg

FIELD: mechanics.

SUBSTANCE: invention relates to "pipe-in-pipe"-type heat exchangers and can be used in various industrial branches. The proposed heat exchanger comprises an inner pipe with external cylindrical ribs representing hollow pipes and turbulator mounted thereon and representing a helical tape coiled on the rod, a tangential branch pipe to feed intertubular medium and that to discharge aforesaid medium. Note here that straight cylindrical ribs, arranged all long the heat exchanger length, are fitted on the inner pipe outer surface with the help of bent metal plates and brought out into common branch pipes of feeding and discharging inner pipe medium via tube plates.

EFFECT: simplified mounting/dismantling, intensified heat exchange, reduced costs of clearing pipes.

2 dwg

FIELD: heat-and-mass transfer.

SUBSTANCE: invention relates to devices designed to cool fluids and distributor thereof, as well as to methods of clearing and sterilising such apparatuses. Proposed device comprises primary heat exchanger, secondary heat exchanger, 1st pipeline for fluid to be cooled to circulate therein. It comprises heat carrier to transfer cooling power to fluid to be cooled that circulates in the 1st pipeline. Note here that aforesaid primary and secondary heat exchangers are arranged, at least, partially, one into another. Note also that primary heat exchanger comprises the 2nd pipeline that passes together with secondary heat exchanger 1st pipeline and around it and along, at least, a portion of the length of aforesaid pipeline. The proposed device additionally comprises fluid source and, at least, one distributor valve. Note here that the said distributor incorporates a cooler implemented in compliance with one of the described versions. Proposed method of sterilising cooled fluid comprises the steps that follows, i.e. draining fluid from the chamber with primary heat exchanger heat carrier, or draining fluid from the 2nd pipeline carrying primary heat exchanger hear carrier, draining fluid from the 1st pipeline that carries fluid to be cooled and distributed, sterilising the 1st pipeline during the period sufficient for killing bacteria and sterilising.

EFFECT: higher efficiency and simpler servicing.

53 cl, 4 dwg

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