Heat exchanger

FIELD: power engineering.

SUBSTANCE: heat exchanger comprises the first pipe section, helically twisted into the first spiral to let through the first working coolant medium. The first spiral and the second spiral produced from the helically twisted second pipe section are inserted one into the other and connected to each other. Besides, the pipe sections are connected by means of a pipe section stretching between opposite ends of both spirals.

EFFECT: higher efficiency of device application.

9 cl, 12 dwg

 

The technical field

The invention relates to a heat exchanger containing pipe section, spirally twisted into a spiral.

The level of technology

Such a heat exchanger is known from patent US 5502829. In this known heat exchanger spiral serves to conduct refrigerant as the working medium of the heat carrier and is surrounded by an elongated housing channel flow, through which by means of the fan the air is supplied as the second working medium fluid.

The problem with this known heat exchanger is that the spiral prevents air flow only on one part of the cross section of the channel flow. In the free inner space of the spiral, and possibly also between the outer space of the spiral and the housing there a higher flow rate than in the immediate vicinity of the spiral, and therefore, a large amount of air passes through the heat exchanger, not coming with the spiral in closer thermal contact. Other parts of the air flow sequentially pass along many turns of the spiral and thus are extremely hot, thus the efficiency of heat transfer is greatly reduced to the back side of the stream to the end of the channel flow.

More compact heat exchanger in comparison with the above described in patent US 3524329. In this heat is bennike pipe, which leads the refrigerant forms in multiple planes, transverse to the direction of air flow in the heat exchanger, a spiral, which are connected to each other in series and alternately have a left or right direction of rotation. However, the manufacture of such a heat exchanger is associated with high costs compared with the first mentioned heat exchanger, as it is not possible to continuously wrap the pipe on the core.

Compact heat exchanger with spiral pipe sections with a consistent flow of the refrigerant is also described in the patent DE-OS 2136369. This known heat exchanger is formed twisted in a spiral tape containing channels for the refrigerant.

The implementation of the invention

The present invention is to create a compact, easily realizable heat exchanger and method of its manufacture.

On the one hand, the task is solved by a heat exchanger having a first pipe section, twisted spiral first coil to the first working medium of the heat carrier, and the first spiral and the second spiral obtained spirally twisted second pipe section, nested one inside the other and connected to each other by the flow passing through their environment.

On the other hand, the task is solved by the method of manufacturing the definition of the tion above the heat exchanger, which one pipe is wound around the first core to form a first spiral, and having a slit second core, at least one slit which may occur inlet and outlet of the spiral is positioned around the first spiral, and from the same pipe on the second core is wound second coil surrounding the first spiral.

Pipe sections of the two spirals are preferably integrally and favorable to wrap the image are connected to each other in one continuous spiral.

To avoid sharp bending of the pipe at the transition from the first to the second spiral, the two spirals swirling preferably with opposite directions of rotation. In this case preferably also tubular sections of the two coils are connected to each other at respective same ends of the two spirals.

An alternative to this pipe sections of the two coils can be connected to a tubular portion which extends between opposite ends of the two spirals. In this case, the direction of rotation of the two spirals may be the same.

Next may be provided for the third and subsequent spiral, which is embedded in the first and second spiral.

The manufacture of the heat exchanger is particularly simple when passing each other in the spiral are remaining unchanged in the longitudinal direction of the cross section, t is to that of the spiral, for example, have a sectional shape of a circular cylinder or a parallelepiped.

To improve the efficiency of the heat exchanger can be favorable that circumstance, if the nested into each other spirals will be tapering in the longitudinal direction of the cross section, for example the cross-section in the shape of a truncated cone.

The free space within the inner spiral can be used because it is the evaporation bath or dryer.

Brief description of drawings

Further characteristics and advantages of the invention follow from the following description of the implementation options with reference to the figures. They show the following.

Figure 1: perspective view of the heat exchanger according to the first variant implementation of the invention.

Figure 2: top view of the heat exchanger of figure 1 in the axial direction.

Figure 3: perspective view of the modified embodiments of the heat exchanger of figure 1.

Figure 4: perspective view of the third embodiments of the heat exchanger.

Figure 5: view along the axis of the fourth embodiments of the heat exchanger.

Fig.6 - 11: manufacturing a heat exchanger according to the invention.

Fig: one stage of manufacture according to figure 10 for a heat exchanger in figure 4.

The implementation of the invention

Shown in figure 1, the heat exchanger siderite whole, paired, made of metal tube, like a spiral spring spiral 1, 2, 3, which in this implementation are coaxial to the longitudinal middle axis M and inside each other, thus nested within each offset and thereby saves space and is very compact. In order that the drawing was clearly presented spirals 1, 2, 3 have five turns; in practice, the number of turns in the more General and therefore the size of the heat exchanger along the longitudinal middle axis M is greater than across it.

Spiral 1, 2, 3 surrounded by represented in the drawing in the opened form, in case 4, which is designed to keep associated along helices 1, 2, 3 airflow. On the housing by means of four struts 5, of which are visible in the figure only two, fixed the fan used for the propulsion of air flow through the housing 4. Not visible on the figure of the propeller fan is facing away from the observer, open the back of the case 4. The fan motor 6 is located in the inner hollow space of the inner helix 1 and thus represents a barrier to flow, which makes passing through the body of the air stream to slide along the helices 1, 2, 3 close to him.

The inlet connection of the refrigerant is indicated pos.7. This inlet is connected is Uchenie 7, the refrigerant is first taken to the inner spiral 1, which has a right-hand direction of rotation. Pipe section 8 forms the transition to the middle left-handed helix 2. The corresponding transition from helix 2 to the outside, again right, helix 3 is drawn from the observer side of the heat exchanger and is not visible in the figure. The refrigerant leaves the heat exchanger through the outlet connection 9.

For clarity, the structure of the heat exchanger figure 2 shows a top view of three helices 1, 2, 3 parallel to the longitudinal middle axis M. In this top view also shows the pipe section 10, which is drawn from the observer end configuration connects helix 2 and 3.

The second embodiment of the heat exchanger shown in figure 3, and in this embodiment, the implementation of the housing, which is not different from the case in the first embodiment, not shown in the figure. Inside the innermost spiral 1 is flat tray 11. If the heat exchanger is built-in refrigeration apparatus, the tray 11 is used as the evaporation trays, i.e. it takes the condensate, which flows from the evaporator of the refrigeration apparatus, and vaporizes him with an air flow passing through the heat exchanger. Therefore, in this implementation there is no need to block the inner part of the inner helix 1 by the fan motor. When a sufficient length of spirals in the hollow space of the solid fuel of an internal helix may be space for the fan motor, and for baths 11.

Instead of trays 11 or, if necessary, together with her within helix 1 can be placed connected in series with the coils 1, 2, 3 dryer refrigerant.

Presented in figure 3 of the drawing the base of the tray 11 has an air gap formed between the floor of the trays 11 and passing underneath the straight segments 12 of the inner spiral, and therefore the lower portions 12 can objectsa air around their perimeter. An alternative to this, the tray 11 can also be mounted directly on the lower sections 12 and therefore they can give warmth flowing through him refrigerant through mount directly on the tray 11.

Nested one inside the other spirals 1, 2, 3 according to a third implementation variant of the heat exchanger shown in figure 4. Under this option all the spirals 1, 2, 3 have the same direction of rotation and the spiral, respectively, are connected to each other passing approximately in the axial direction of the pipe section 13 or 14, which takes place essentially in the axial direction in the intermediate space between the two helices 1, 2 or 2, 3 from one end of the heat exchanger to the other. The flow direction of the refrigerant relative to the longitudinal middle axis M in all three helices 1, 2, 3 are the same. That is, if the air flowing through the heat exchanger in the direction of the arrow P and the connection 7 and as in the first variant of realization, serve as inlet and outlet connections, all three spirals 1, 2, 3 are in counter-current.

Pipe sections 13, 14 in this implementation can also take a stabilizing function for the location of the spiral due to the fact that they need to use insulated mid-layer coils mounted on one of the two coils, between which they pass, or also on both spirals.

Figure 5 shows an axial section through the spiral heat exchanger according to the fourth variant of the invention, and lying above the plane of the cut sections of spirals respectively represented as dashed contours. Spiral 1, 2 are held on the tapered surfaces, i.e. the diameter of the turns decreases in a direction from one longitudinal end of the heat exchanger to the other. The advantage of this arrangement is that when the air flows through the spiral parallel to the longitudinal middle axis, all of the spiral, and also those who are on the lower stream end of the heat exchanger, are streamed with air that has not yet warmed to the other spiral.

A method of manufacturing a heat exchanger according to the present invention are explained with the help of 6-11.

6 shows a cylindrical core 15 and the coil 16 with the thin-walled metal tube, n is the sample, from copper. The free end of the metal pipe is temporarily fixed to the surface of the core 15. Due to the simultaneous rotation of the core 15 and the shift coil 16 along the core 15 of the metal pipe is unwound from the reel 16 and is wound evenly spaced from each other coils on the core 15, as shown in Fig.7. So it turns out the spiral 1.

After the coil 1 is completely finished, the second core 17 in the form of a longitudinally slit sleeve, coming in the axial direction of the first core 15 and the coil 1, and the free end of the pipe protrudes through the slot 18, as shown in Fig.

If at the stage Fig.9 second core 17 fully nadenut on the first core 15, and the pipe section 8 connecting helix 1 with the coil 16, passes through the slit 17.

Both core 15, 17 rotate together, and simultaneously, the coil 16 is shifted to the cores 15, 17 back into its original position. Thus, as shown in figure 10, it turns out the second spiral 2.

Next, as shown in figure 11, the third, also with the gap of the core 19, coming on the cores 15, 17 and spirals 1, 2, and again the free end of the pipe and the pipe section 10 pass through the slit 20 of the core 19. Rotation of the cores and shift coil 16 on the core 19 is formed helix 3. As this process occurs in the same way, Thu and the winding of the coils 1 and 2, he no longer presented on the figures. Obviously, depending on the needs of the number of cores and hence the resulting spirals in principle can be increased to any desired number.

When reached the desired number of spirals, unlinked temporary fastening pipes on the inner core 15, and the cores removed.

Manufacturer of heat exchanger, shown in figure 4 type occurs before stage Fig.9 exactly the same as described above. But instead, as shown in figure 10, directly to start the winding of the helix 2 with the opposite direction of rotation, the pipe, as shown in Fig back is pulled into the slot 18 of the core 17 along the entire length of helix 1 to form described with reference to figure 4 section 13, and finally the coil 2 is wound with the same direction of rotation as that of the spiral 1. For all subsequent spirals saved the same way.

1. The heat exchanger containing the first pipe section, spirally twisted in the first coil (1) for the first operating environment of the coolant, characterized in that the first coil (1) and obtained from a helical swirling of the second pipe section, the second coil (2, 3) are nested one inside the other and connected to each other, whereby the pipe sections are connected by means of pipe section (13, 14), which pass the t between the opposing ends of the two helices (1, 2, 3).

2. The heat exchanger according to claim 1, characterized in that the tubular sections of the two coils (1, 2, 3) are connected to each other in a single unit.

3. The heat exchanger according to claim 2, characterized in that the two coils (1, 2) twisted with opposite directions of rotation.

4. The heat exchanger according to claim 1, characterized in that there is at least one third coil, which is nested within the first and second spiral.

5. The heat exchanger according to one of claims 1 to 4, characterized in that the coils (1, 2, 3) nested concentric.

6. The heat exchanger according to one of claims 1 to 4, characterized in that the coils (1, 2, 3) are continuous in the longitudinal direction of the cross section.

7. The heat exchanger according to one of claims 1 to 4, characterized in that the spirals are tapered in the longitudinal direction of the cross section.

8. The heat exchanger according to one of claims 1 to 4, characterized in that the inside of the inner coil (1) is the evaporation bath or dryer.

9. A method of manufacturing a heat exchanger, as claimed in any of the preceding paragraphs, in which the tube is wound around the first core (15)to form a first spiral (1), around the first coil (1) have provided with a slit second core (17) and from the same pipe on the second core (17) is wound second coil (2), surrounding the first coil (1).



 

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