Heat exchanger

FIELD: power engineering.

SUBSTANCE: heat exchanger comprising a twisted pipeline, supplying a fluid working medium to the heat exchanger, a helical axis of horizontal direction and parts of the twisted pipeline arranged on the top and bottom from the helical axis. In accordance with this invention the helical pipeline provides for a double-section passage circuit, besides, the first passage circuit having large dimensions is designed for the working medium of the heat exchanger, and the second smaller circuit of passage is designed as a ventilation circuit. At the same time for each spiral passage in the upper part of the helical axis on a part of the twisted pipeline there is at least one hole for air exhaust, which connect to each other the first and second passage circuits.

EFFECT: provision of maximum possible ventilation for a heat exchanger with a pipeline of twisted type and a horizontal helical axis.

9 cl, 4 dwg

 

The invention relates to a heat exchanger corresponding to the broad description of the patent formula 1.

The heat exchanger of the previously mentioned type, which is in accordance with DE 20009560 consists of twisted pipe spiral type conductive to the heat exchanger liquid environment, the screw axis to the horizontal direction and twisted parts of the pipeline that are located above and below the screw axis. On the outer circumference of the twisted pipe heat exchanger nozzles are provided for connecting the inflow and the outflow circulation, which not only serves for supplying and discharging working fluid of the heat exchanger, but also for ventilation. This heat exchanger is part of a heating boiler; it encircles the combustion chamber with a burner, of which the direction of flow twisted pipeline departs exhaust gas and gives off its heat to the liquid working medium of the heat exchanger.

The main objective of the invention is to provide a heat exchanger with pipeline twisted type and horizontal screw axis maximum possible ventilation regardless of the equipment of the heat exchanger described above pipe to connect the inflow and the outflow circulation.

This task in relation to the heat exchanger of the initially mentioned type is solved by the characteristics, which are presented in the example in Pat is nteu formula 1 properties. It should be noted that corresponds to the invention the heat exchanger is not limited to use in the boiler, but can also be installed in the capacitive water heaters (in this case, the heat exchanger is surrounded not by the off gas burners, and is washed by warm water), in which equally might be a problem of deterioration of heat transfer due to gas supply.

Thus, the invention assumes that the flow path twisted pipeline detects two loop course, the first of which is large and intended for the working medium of the heat exchanger, and the second lower flow path of the spiral form is designed to provide ventilation, and for each spiral passage in the area above the screw axis on wit the pipeline has at least one hole for air release, which connect between the first and second flow paths.

When this condition two loop course provides not only the technical ability fundamentally solid twisted pipeline with two cameras of course, but also the function of which will be embedded in a twisted tube of additional structural elements. In other words, if this option twisted in the pipeline is a vie is the second piping (vent side) the accumulation of air or gas would theoretically be deleted after a prescribed mainly in the upper region of each loop hole for air release.

For a better understanding of the invention, consider the following: in the heat exchangers and piping twisted forms and horizontal screw axis fundamental problem is that the gas flowing in the heat exchanger, the working medium under gravity accumulates in the upper region of a twisted pipe that is undesirable because it contributes to poor heat transfer. The design of the heat exchanger in accordance with DE 20009560 U1, assumes every second circuit includes a nozzle through which the gas can be removed (gas accumulates in the flow paths in any case, even in the absence of such connections). In heat exchangers, in which the nozzles are not provided by, for example, corresponding EP 1562006 A1, the importance of this phenomenon depends on the size of the structure.

The present invention solves this problem because it provides the ability to remove gas in those places where it accumulates, i.e. provides in these places, at least one opening for discharge of the air through which it is possible to divert gas.

Besides the fact that the ventilation circuit PLO the bone cross-section must be less than the twisted pipe, this condition implies that the ventilation holes are, firstly, should be located in the pipeline in a certain way, and, secondly, to promote elimination, primarily gas and fine particles from the working medium of the heat exchanger. This condition is described in more detail hereinafter. Improved versions of the heat exchanger according to this invention are disclosed in the respective dependent claims.

The heat exchanger in accordance with the conditions of the invention and its improved variants described in the claims, and shown in detail on the following graphic illustrations of different variants:

figure 1 - schematic representation of the first design of the heat exchanger corresponding to the present invention, in longitudinal section;

Fig.2 is a perspective partial picture of a preferred form of execution of the ventilation circuit to wit pipeline with special tabs;

Fig.3 is a perspective partial picture of the ventilation circuit corresponding to Fig.3, without twisted pipeline; and Fig.4 is a perspective image of the ventilation circuit, as a separate structural element.

Figure 1 shows an abstract form of performance of the heat exchanger corresponding to the present invention, which comprises (this singing is out also correlated with structural forms of execution, figures 2-4) of the twisted tubing 1, conductive to the heat exchanger liquid environment, which detects the rectangular outline of the course, the screw axis 2 to the horizontal direction and twisted parts of the pipeline 3 and 4, which are located above and below the screw axis 2. This twisted tube has a spiral shape. If the pipeline is used as a heat exchanger for a heating boiler, it provides a slot for the flow 10 (shown by dashed contour), through which flows the hot exhaust gas of the burner and thereby heats the working medium of the heat exchanger in wit the pipeline.

The essential feature of the heat exchanger corresponding to the conditions of the present invention, is the fact that twisted tube 1 has a two-loop course, and the first flow path 5, which is of large dimensions, is provided for the working medium of the heat exchanger, and the second lower flow path 6 is designed as a ventilation circuit (system) 7. For each spiral passage in the area above the screw axis 2 on the part of the twisted pipe 3 is provided at least one hole for air release 8, which connects the first and second flow paths 5 and 6.

Re the reference to R is C.1 shows the heat exchanger is, as expected theoretically) essentially one-piece construction with two circuits of the course. In this case, holes for air release 8 may be performed, for example, by double drilling twisted pipe and then welding the outer holes.

However, more preferable from the technological point of view, it is the solution corresponding to Fig.2-4, which implies the execution of the ventilation circuit 7 as a separate structural element with the subsequent installation in a twisted tube, and under "setup" in particular means corkscrew "screwing" or "screwing" is made of the vent path 7 spiral shape in the twisted tubing 1.

Order through the vent path 7 were eliminated as little as possible of the working medium of the heat exchanger, the cross-sectional area of the outlet openings of the air 8 must be less than the flow path 6 of the ventilation system 7. In addition, since the flow path 5 for the working medium of the heat exchanger more of the flow path 6 of the ventilation system 7, respectively, the cross-sectional area of the hole for air release 8 should be much smaller than the flow path 5 for the working medium of the heat exchanger. This condition about kasliwal pressure drop inside the heat exchanger, firstly, ensure good ventilation and, secondly, leads to very small losses of the working medium of the heat exchanger through the ventilation path.

The most preferred technology solution provides round shape of the flow path 6 of the ventilation system 7 and a circular cross-section hole for air release 8. Of course, for the ventilation circuit 7 is also possible to use other profiles (e.g., rectangular) and form holes for air release 8 (e.g., fricatives). It is obvious that the tubular loop with a simple hole or multiple holes are easier to manufacture.

To ensure more reliable position of the vent path 7 twisted inside the pipeline 1 is assumed (see Fig.4)that is made in spiral form of the vent path 7 preferably should speak to three radius and twisted inside the pipeline 1 to rely on the projections 9. When it is determined based on projections 9 external diameter of the ventilation circuit 7 correspond approximately to the inner diameter of the flow path 5 for the working medium of the heat exchanger, i.e. after screwing the vent path 7 is supposed to be supported elastically by the inner walls of the twisted tubing 1 to permanently secure the position of the ventilation circuit 7 within the total pipeline 1, that is especially important in relation to the position of the hole for air release 8, since the ventilation heat exchanger functions best when the hole for air release 8 is at the very top inside the twisted pipe 1. In this regard, it is preferable in the upper area of the upper part of the twisted pipe 3 to have one of the projections 9, which must be provided by the hole for air release 8 (see Fig.2 and 3).

Meet the requirements of the invention the heat exchanger, namely the technical equipment of the heat exchanger corresponding to the conditions of the invention, operates as follows:

consider, for example, a new installation of a heating boiler with heat exchanger horizontal orientation. Coming from the working medium of the heat exchanger dissolved gas (particularly air), under the conditions of gravity accumulates at the top of a twisted pipe 1. However, due to the fact that it is at this point provides a vent path 7 with a hole for air release 8, the gas can be removed through the vent path 7, which at least temporarily (e.g., using a valve quick exhaust) is connected with the environment of the heat exchanger. In other words, due to the pressure in the heat exchanger excess gas is removed from the heat exchanger through the hole for air release 8 the vent path 7, eliminating the causes that prevent process of heat transfer. In contrast to well-known methods for removing gas from the horizontal heat exchanger (typically, due to the high bandwidth of the heat exchanger) heat exchanger in accordance with the conditions of the present invention, characterized by the presence of all contours screwed ventilation system with external holes, ensuring an efficient flow of air, and such air removal can be done by starting a heat exchanger in operation, and again at any time thereafter.

Finally, the present invention provides an appropriate abstraction of both ends of the ventilation path of the twisted tubing 1. For this purpose (see Fig.2) can be used, for example, a cap (not shown in the figure), which will cover the twisted tubing and one of the holes of the circuit of the ventilation system. It is necessary to clarify that the performance of the ventilation circuit according to Fig.2, at least initially, should be made taking into account the possibility of free screwing. In addition, the channel for the passage of air, at least one side of the ventilation circuit must be opened for the environment (for example, the working medium of the heat exchanger), which will provide a minimum level of pressure the Oia.

The reference list of items

1 Twisted tube

2 Screw axis

3 Piece twisted pipeline

4 some of the twisted pipe

5, the First flow path

6 the Second circuit flow

7 Ventilation circuit (system)

8 Hole for air release

9 Ledge

10 Slot for the flow.

1. A heat exchanger consisting of a twisted pipe (1)conducting to the heat exchanger liquid environment, the screw axis (2) horizontal direction and twisted parts of the pipeline (3 and 4), which are located above and below the screw axis (2), characterized in that the twisted tube (1) contains a two-loop course, and the first flow path (5), with large sizes, is designed for the working medium of the heat exchanger, and the second lower flow path (6) is designed as a ventilation circuit (7)for each spiral passage in the upper region of the screw axis (2) on the part of the twisted pipe (3) has at least one hole for air release (8), which connect between the first and second flow paths (5, 6).

2. The heat exchanger according to claim 1, characterized in that the ventilation circuit (7) is designed as a separate structural element that is installed in wit the pipeline (1).

3. The heat exchanger according to claim 1, characterized in that the hole for vypuskavshem (8) has a sectional area smaller than the flow path (6) of the ventilation circuit (7).

4. The heat exchanger according to claim 1, characterized in that the flow path (6) of the ventilation circuit (7) is made of a round shape.

5. The heat exchanger according to claim 1, characterized in that the hole for air release (8) has a circular cross-section or made in the form of a narrow or slot.

6. The heat exchanger according to claim 1, characterized in that the ventilation circuit (7) has a spiral shape.

7. The heat exchanger according to claim 6, characterized in that the ventilation circuit (7) spiral shape are distributed around the circumference and preferably acts on three radius and twisted inside of the pipeline (1) supported on the protrusions (9).

8. The heat exchanger according to claim 7, wherein one of the projections (9) is located in the upper area of the upper part of the twisted pipe (3), and on this ledge (9) made a hole for air release (8).

9. The heat exchanger according to claim 1, characterized in that the design of the ventilation circuit (7) includes at least a temporary connection with the working medium of the heat exchanger.



 

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