CN1761841B - Water heater - Google Patents

Abstract

The invention relates to a water heater having a heating module (M) which comprises at least one tubular heating body (K1, K2) in a heating zone (H) in the interior thereof, which is at least substantially annular and is connected to an inlet and an outlet, the heating zone (H) having, in an inflow region (E), an interruption which defines two separate flow path starting points (13, 14) in the annular extension, and a drain opening arrangement (15) which is connected to the outlet (A) being positioned in the heating zone (H) away from the inflow region (E) such that the two flow paths (R1, R2) are at least substantially equally long from the inflow region (E) to the drain opening arrangement (15).

Description

water heater

The invention relates to a water heater with a heating module containing at least one tubular heating element in a heating zone of its annular interior space connected to an inlet and an outlet. the

The water heater disclosed by DE10130610A has an annular inner space in its heating zone, in which there are no tubular heating elements of two heating stages, and the water flows in the pipeline in one direction. Undesirably, in such a design, cold water would mix with heated water. Due to the greater degree of curvature, there are regions of high power density outwards on the extension of the tubular heating body, which cannot be sufficiently cooled in the circumferentially continuous annular interior space. the

The object of the present invention is to provide a water heater of the type mentioned at the outset, in which no uncontrollable mixing of cold and hot water occurs during its operation and in which, in its heating zone, due to the greater power density, the tubular heating Critical areas of the body are cooled rapidly. the

This task is solved by a water heater. The water heater has a heating module which contains at least one tubular heating body in a heating zone of its annular interior space which is connected to an inlet and an outlet. According to the invention, the heating zone has an interruption in the annular extension defining two separate start points of the flow paths, in which an inflow area towards the start of the flow paths is provided, and the heating block connected to the outlet of the heating module One outfall arrangement of the zone is remote from the inflow area and is positioned such that the two flow paths from the inflow area to the outfall arrangement are of equal length. the

Mixing of cold and hot water is avoided due to the interrupted part which prevents the circular circulation of the water and forces the water to follow the two flow paths to the drain device. Because there is always a set flow state and the cold water has to enter in a predetermined heating area, due to the greater power density, it is possible to place here the critical area of each tubular heating body, so that it is cooled very adequately. This increases the working safety and prolongs the service life of the individual tubular heating elements. the

Expediently, two separate inflow paths to the heating zone are provided in the inflow region. Favorable flow conditions are thus achieved along each flow path during the flow, wherein the water, which flows uniformly, is continuously heated and reaches a maximum temperature at the outfall arrangement and on leaving the heating zone. There is no mixing of cold and hot water during the flow. the

The outfall arrangement can separate the water in each flow path and direct it further if necessary. But the preferred solution is to design only one drain, shared by both flow paths. the

Up to the interruption, the heating zone is as circular as possible. The inflow channel extends outside the heating zone and inside the ring, where the inflow channel extends to an inlet connection located there. At least one drain channel extends along the outer side of the ring between the outlet fitting and the drain means mounted on the outside of the ring adjacent the interruption. Although in this way the inlet pipe and the drain pipe are arranged very close to each other, the flow paths of the cold water and the hot water are far apart so that no undesired heat exchange takes place. the

From the junction of the inflow conduit inside the ring, an inlet passage extends from the inlet beyond the interruption. It may be an insert installed during the final assembly process of the heating module. An undesired transfer of heat from hot to cold water is thus reliably avoided. the

The suitable length of the interrupted portion is about one-third to one-fifth, preferably one-quarter, of the total length of the ring. With the dimensions of this interruption, the inflow channel can be kept in a good shape (sauber), resulting in a smooth, even flow of water in both flow paths. On the other hand, in order to obtain the largest possible volume in the heating zone and relatively long flow paths in the case of round heating modules, the interruptions have to be as small as possible. the

Taking into account the technical configuration of the heating module and optimum utilization of the heating power, at least one tubular heating body should extend approximately continuously from one flow path start to the other flow path start in the heating zone, but not beyond interruptions. the

In a suitable embodiment, the tubular heating body in the heating zone forms two bends of about 90° towards its connection end respectively, and forms a bend of 180° in the reverse region, wherein the bends are positioned between the two flows Near the start of the path. Due to such a configuration, the critical bends are well cooled by the cold water flowing in during the flow-through process due to the high power density. the

According to a further advantageous embodiment, at least two similarly constructed tubular heating elements with offset connecting ends are arranged in the heating zone. For example, a water heater can operate on two different power levels. Each tubular heating element is well cooled by the inflowing cold water in its region which is critical due to the high power density. the

In a further embodiment, only one single-piece tubular heating body is provided in the heating zone, which tubular heating body extends in multiple lines, preferably in two lines, in the annular plane and perpendicular to the annular plane. For rapid cooling of critical areas of the tubular heating body, these areas should be located near the start of the flow path. the

In the operating and assembled state of the water heater, the annular plane of the heating zone should be arranged essentially vertically with the interruption pointing downwards and the drain arrangement located above, wherein both the inlet and the outlet can be located below. This state of assembly encourages water to follow two flow paths as the heated water flows upwards for physical reasons and then to the upper drain arrangement. The water temperature is always at its maximum at the drain fitting. the

Since the highest water temperature occurs at the drain device at the top, it is appropriate to equip the heating zone with a bimetal switch there, which can cut off the power supply when the temperature is too high or fails, and can also provide regulation for the adjustment of the heating power parameter. the

The cross-section of the heating zone should be a multiple of the cross-section of each inflow path and drain arrangement or drain, thereby creating an intermediate storage container of relatively large volume for water. In this way, after a brief interruption of the water flow, there is an absolutely massive supply of hot water, so that the water heater can provide hot water again immediately without a perceptible start-up time. the

In a preferred embodiment, the heating module is substantially circular. It consists of two plastic injection-molded parts joined together, which can be mass-produced at low cost and meet all required design details. The circular design of the heating module guides two flow paths that arc first outward from the inflow area and then inward toward the drain arrangement. Alternatively, it is also possible to select an extension profile that deviates from the curvature for both flow paths. The flow path can also follow a polygonal path, or run around the center of a circle. the

Below, describe embodiment of the present invention in detail in conjunction with accompanying drawing, wherein:

The perspective view (outer cover is taken off) of Fig. 1 water heater, is first kind of embodiment, and heating body is not shown;

Figure 2 is a bottom view of the water heater molding shown in Figure 1, another embodiment. the

The water heater shown in FIG. 1 is, for example, a so-called shower water heater, which is used, for example, for at least one hot shower, at least in the installed and operating state shown in FIG. 1 . The construction principles described next for the water heater are also generally applicable to other once-through water heaters and similar domestic appliances. the

The main component of the water heater W shown in FIG. 1 is a circular heating module M, which may consist of two interconnected, for example welded, plastic injection-molded parts. In operation, the water heater is covered by a cover not shown in FIG. 1, which can be made into a spherical arch shape and locked together with the heating module M, wherein the covering cover tightly surrounds most of the circumference of the heating module M. the

The heating module is supplied with cold water by inlet Z. Hot water is discharged through outlet A. Inlet Z and outlet A are located below and at an intermediate distance in the embodiment shown. The two molded parts 1 , 2 internally delimit a heating zone H which, in the embodiment shown, is formed annularly up to the interruption U in the inflow region E. FIG. A socket 3 into which the bimetallic switch B can be plugged can be formed in the shaped part 1 . This socket 3 is located in the heating zone where the hot water reaches its maximum temperature. The two shaped parts 1 , 2 delimit with one another a laminar box D for flow-related connection at the preferred heating power and cooperating with an internally installed Venturi nozzle (not shown) , so that the necessary switching force is generated by the pressure difference created during the flow. the

The inlet channel 5 extends from the inlet Z on the outside of the ring to the connection 4 on the shaped part 1 . The inlet channel may be an insert extending above the wall of the shaped part 1 delimiting the interruption U. On the outside of the heating zone H there is likewise a curved drain pipe 7 leading to the connection 6 to the outlet A. To the cover plate of the heating zone H adjacent to the interruption U are formed through-holes 8a, 8b (respectively in pairs) for the connecting ends of the tubular heating bodies K1, K2 not shown in FIG. 1 . If the water heater W only works through one tubular heating body K1, only a pair of through holes 8a or 8b are required.

The water flow direction in the heating module M and the structure of the tubular heating body will be described in detail below with reference to FIG. 1 and FIG. 2 . the

FIG. 2 is a bottom view of the shaped part 1 of FIG. 1 , but according to another embodiment, there is only one tubular heating body K1 consisting of multiple, more precisely double, circuits. The heating zone H is an annular recess 9 with a U-shaped cross section, which is open when viewed in the plane of the drawing and is closed in the assembled heating module M by an essentially flat cover of the other molded part 2 . The depression 9 is delimited on both outer sides by closed or welded edges 10 . An inflow channel 11 extends from the connection 4 into an inflow region E located in the annular interruption U. FIG. the

For example, a Venturi nozzle, as already mentioned, can be provided in the inflow channel 11 , ie, it can be formed as a separately produced and used component, or it can be formed directly in one piece in the interior of the inflow channel 11 . The inflow channel 11 branches off in the interruption U into two separate inflow paths 12 . Each inflow path 12 injects water into the heating zone or depression 9 at the beginning 13 or 14 of the flow path. In the heating zone, approximately directly opposite the point where the inflow channel 11 branches into two inflow paths 12, there is provided a drain opening device 15, which can have, for example, two separate openings, or, as shown, only one drain mouth. From the flow path origins 13 , 14 there are thus two separate flow paths R1 , R2 extending to a common outfall arrangement 15 . A drain channel 7 leading to the connection 6 and the outlet A is connected to the drain opening 16 . If necessary, two water drainage channels 7 can be designed in a curved direction along the outer side of the heating zone H. the

On the tubular heating body K1 shown in FIG. 2, there are connecting ends 17 substantially perpendicular to the plane of the drawing, which can pass through the through-holes 8a or 8b in the shaped part 1, or, as shown in FIG. 2, through another shaped Part 2 extends outward. A 90° bend 19 is formed between each connecting end 17 and the line 18 of the tubular heating body K1 extending in the heating zone H. The line 18 passes inside the heating zone H until another flow path start 14, where it turns outwards on a 180° bend 20 and runs down in the line 21 until another 180° bend twenty two. From there, another line 23 continues under line 21 to another flow path start point 14, where it bends inwardly under this bend, as at the 180° bend 20, and returns to the other connection end . Critical bends 19 , 22 , 20 due to the greater power density are located close to the start 13 , 14 of the first and second flow paths, so that they are continuously cooled by the rapidly flowing cold water in the water flow. the

The interruption U in the annular body requires a curvature X of between approximately one-third and one-fifth of the total annular length, preferably approximately one-quarter. the

Due to the large distance between the flow path start points 13, 14 and the outfall arrangement 15, the cold water does not mix with the hot water. The highest water temperature always occurs at the drain 15 . The critical areas of the tubular heating body produced due to the high power density are rapidly cooled by the inflow of cold water. the

According to the embodiment in Fig. 1, two tubular heating bodies K1, K2 can be constructed, and then the tubular heating bodies are properly placed one above the other, separated from each other and separated from the inner wall of the heating zone. the

Claims (18)

1. A water heater (W) with a heating module (M) in a heating zone ( H) contains at least one tubular heating body (K1, K2), characterized in that the heating zone (H) has an interruption (U) defining two separate flow path start points (13, 14) in the annular extension , in the interruption (U) there is an inflow area (E) towards the beginning of the flow path (13, 14) and a drain of the heating area (H) connected to the outlet (A) of the heating module (M) The port means (15) is remote from the inflow area and the outfall means is located such that the two flow paths (R1, R2) from the inflow area to the outfall means (15) are of equal length. 2. The water heater according to claim 1, characterized in that two separate inflow paths (12) branched off by an inflow channel (11) within the interruption (U) are provided in the inflow area (E) , the inflow path leads to the start of the flow path (13, 14) within the heating zone (H). 3. Water heater according to claim 1, characterized in that the outfall means (15) is a common outfall (16) for both flow paths (R1, R2) in the heating zone (H). 4. Water heater according to claim 2, characterized in that the heating zone (H) extends annularly up to the interruption, the inflow channel (11) extending into the annular interior to a joint (4) of the inlet (Z), This joint is installed in the inside of the ring and is formed in the heating module (M), between a joint (6) of the outlet (A) mounted on the outside of the ring, near the interruption (U) and the drain means (15) At least one drainage channel (7) extends along the outside of the ring. 5. The water heater according to claim 4, characterized in that the inlet (Z) is arranged on the outer side of the ring, and there is an inlet channel (5) extending from the interrupted part (U) extending from the inlet (Z) until the joint (4) ). 6. The water heater according to claim 1, characterized in that the interrupted part (U) inside the ring occupies one-third to one-fifth of the total ring length. 7. The water heater according to claim 1, characterized in that the tubular heating body (K1, K2) in the heating zone (H) extends continuously from the starting point (13) of the one flow path to the starting point of the other flow path (14). 8. The water heater according to claim 7, characterized in that, the tubular heating body (K1, K2) in the heating zone (H) has two angles with the connecting end (17) of the tubular heating body that are 90°. Bending portion (19); and there is a 180° bending portion (22, 20) at the turning point of a tubular heating body, and the two angles between the connecting end (17) and the tubular heating body are 90° bending portions ( 19 ) and the 180° bends ( 20 , 22 ) at the return of the tubular heating body are adjacent to the two flow path origins ( 13 , 14 ). 9. The water heater according to claim 7 or 8, characterized in that at least two overlapping tubular heating bodies (K1, K2) with staggered connecting ends (17) are provided in the heating zone (H) ). 10. The water heater according to claim 7, characterized in that the single-piece tubular heating body (K1) in the heating zone (H) consists of a plurality of lines extending perpendicular to the plane of the annular inner space, and in A 180° bend (22, 20) formed between each line (18, 23) is adjacent to two flow path origins (13, 14). 11. The water heater as claimed in claim 1, characterized in that the annular plane of the heating zone (H) in the operating state and in the assembled state of the water heater (W) is connected with an interruption (U) pointing downwards and an upper drain The mouth device (15) is vertical, with the inlet and outlet (Z, A) located below. 12. The water heater according to claim 1, characterized in that there is a bimetallic switch (B) corresponding to the heating zone (H) in the area of the drain device (15). 13. The water heater according to claim 2, characterized in that the cross-section in the heating zone (H) is multiple times the cross-section of each inflow path (12) and the water outlet device (15), so that the heating zone (H) ) constitutes an intermediate storage container for water. 14. The water heater according to claim 4, characterized in that the heating module (M) is circular and consists of two interconnected plastic injection molded parts (1, 2), in which one molded part (1 ), the heating zone (H) is formed as a depression with a U-shaped cross-section, and a break-off section is concavely formed with a partial area of the inflow path (12) and the drainage channel (7) ;In the other profiled part (2), a flat cover plate for the heating zone (H) is molded, and a further break-off section is formed, which has an inflow path (12) and part of the drainage channel (7). 15. Water heater according to claim 1, characterized in that said water heater is a shower heater (SH). 16. The water heater of claim 5, wherein said inlet passage is an insert. 17. A water heater as claimed in claim 1, characterized in that the interruption (U) inside the ring occupies a quarter of the total ring length. 18. The water heater according to claim 10, characterized in that the tubular heating body (K1) consists of two lines.

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