water heater

Abstract

Water heater, with a base container (5) for holding water, which an inlet (40) for water to be heated, a drain (30) for heated water, and has an outwardly open receiving chamber (70) for the exchangeable accommodation of system components, wherein the base container (5) has a first container half (10) and a second container half (20), wherein the inlet (40) is designed as an inlet pipe which has a first section (41) and a second section (42), wherein the first section (41) is connected to the first container half (10) and the second section (42) is connected to the second container half (20), wherein the outwardly open receiving chamber (70) is connected to the first or second container half (10, 20), wherein the first and second sections (41, 42) of the inlet pipe (40) are inserted into one another and / or welded together, wherein the second section (42) of the inlet pipe (40) ends in the lower region of the second container half (20) and has an opening (42a), wherein an inflow area (22) is arranged in the lower area of ​​the base container, which is connected to the inlet (40), wherein in the region of the transition between the second section (42) and the inflow region (22) a first wall (W1) is arranged, which is arranged perpendicular to the longitudinal axis of the second section (42), wherein a fourth wall (W4) is arranged perpendicular to the first wall (W1), so that the cross section of the walls (W1, W4) is designed as an inverted U, wherein a second wall (W2) is arranged in the inflow region (22) in the longitudinal direction of the second section (42), and wherein the second wall (W2) has openings (22b), wherein a third wall (W3) is arranged in the inflow region (22) parallel to the second wall (W2), and wherein the third wall (W3) has openings (22c), wherein the first, third and fourth walls (W1, W3, W4) form a flow channel opening towards the center of the storage tank and the second wall (W2) is arranged in this flow channel.

Description

[0001] The present invention relates to a water heater.

[0002] DE 201 09 029 U1 discloses a storage tank for a water heater. This storage tank consists of an upper and lower tank sections. A cold water supply line runs along the tank and discharges into the bottom of the storage tank. The cold water supply line consists of two halves, each of which is manufactured as a single piece with the tank halves and is joined together by welding the two halves.

[0003] DE 299 08 555 U1 shows a storage tank for hot water storage. The tank consists of two half-shells welded horizontally together via a reinforcement collar. The tank also features an injected surface heating system and injected water inlet / outlet nozzles.

[0004] Several problems arise during operation with the water heaters described above. For example, in an under-sink storage tank, the tank, together with a thermostatic mixer, forms a thermosiphon system. The warm water circulates between the tank and the faucet until rising bubbles from the tank interrupt the circulation by forming an air cushion.

[0005] According to the teaching of DE 12 05 017 A, a thermosiphon is arranged between a drain pipe and the tap, i.e., outside the tank. However, this proves to be disadvantageous in terms of a compact design.

[0006] DE 42 18 992 C2 shows a heat brake for a hot water tank. For this purpose, a brake body is placed in one of the pipe connections. The brake body has a flow channel that changes direction several times and has a downward flow direction at least once.

[0007] DE 43 36 190 A1 discloses another heat brake for a hot water tank, wherein the heat brake is arranged inside the hot water tank. The heat brake also has a brake body whose flow channel has at least one region with a downward flow direction.

[0008] DE 195 33 388 A1 showed a pipe fitting for interrupting a warm water convection flow. A water-conducting receptacle forms a receiving space between an inlet and an outlet opening, into which a siphon body is inserted. The siphon body has an inlet channel, an outlet channel, and a diversion channel.

[0009] Other problems with the storage tanks listed above can include dripping. Dripping in a water heater is caused by thermal expansion of the water, CO2 emissions, expansion and contraction of the base tank after tapping, and / or the geometry of the drain (backflowing water in the outlet). Dripping caused by CO2 emissions can only be prevented by a vent valve at the highest point of the tank. However, this proves to be disadvantageous in terms of leaks and possible microbial contamination. Dripping caused by expansion and contraction of the tank can only be reduced by a pressure-resistant tank. Finally, downward-curved faucet outlets drain dry or drip, so this problem cannot be solved in the tank.

[0010] DE 41 39 278 C2 discloses a device for preventing dripping in a water heater. This device comprises a water jet pump which, when a tap located in the waterway upstream of the water tank is opened at a water pressure above a threshold value, releases a volume in a connected compensation chamber to absorb the expansion water generated during heating of the water tank. The water jet pump is connected to a cold water inlet line. Furthermore, a bypass valve is provided which opens when an opening pressure threshold value is reached that is greater than the water pump's threshold value.

[0011] DE 38 36 877 C1 also discloses a device for preventing dripping in a water heater. This device comprises a water jet pump arranged between a tap valve and a mixing valve of a low-pressure fitting. The water jet pump is connected to a chamber via a suction line. As long as water is being drawn, the water jet pump draws water from the chamber. After drawing, the chamber refills with water, which is drawn back either from the fitting piping or from the hot water tank. The space thus freed up can be filled with expansion water during reheating.

[0012] In order to solve the problems with water heaters mentioned above, different basic containers for the water heaters were previously necessary in order to integrate the various additional components required.

[0013] The object of the present invention is to provide a water heater which has a basic tank and can be upgraded with additional components.

[0014] This object is achieved by a water heater according to claim 1 and claim 4.

[0015] Thus, a water heater is provided that has a base tank for holding water. The base tank has an inlet for the water to be heated and an outlet for the heated water. The base tank also has an outwardly open receiving chamber for the exchangeable storage of system components.

[0016] This means that the basic container can be retained for different or different design variants, while the additional components are housed in the receiving chamber in such a way that they can be exchanged.

[0017] According to one aspect of the present invention, the inlet is configured as an inlet pipe. The base container has a first half and a second half. A first section of the inlet pipe is connected to the first half of the base container, and a second section is connected to the second half of the base container. Thus, a long inlet pipe can be provided in two parts, with the first section being attached to the first half and the second section being attached to the second half, so that the water flows through the inlet pipe into the lower region of the base container.

[0018] Further embodiments of the invention are the subject of the subclaims.

[0019] The invention is explained in more detail below with reference to the embodiments shown in the figures. Fig. 1 shows a sectional view of a base tank 5 for a water heater according to the first embodiment, Fig. 2 shows a sectional view of the base container 5 according to a second embodiment, Fig. 3 shows a schematic sectional view of a water heater according to the third embodiment, Fig. 4 shows a base container 5 for a water heater according to a fourth embodiment of the invention, Fig. 5a shows a perspective sectional view of the drain 30 and the thermostop means according to a fifth embodiment, Fig. 5b shows a perspective view of the thermostop means 80, Fig. 5c shows a further perspective view of the thermostop means according to the fourth embodiment, Fig. 6 shows a perspective view of a section of the upper container half in the area of ​​the drain according to a sixth embodiment, Fig.7a shows a perspective view of a portion of the upper container half with a thermostop means according to a seventh embodiment, Fig. Figure 7b shows a perspective view of a thermostop device of Fig. 7a, Fig. 7c shows a sectional view of a section of the upper half of the container in the area of ​​the drain, Fig. Figure 7d shows a perspective view of the thermostop means of Fig. 7c, Fig. 7e shows a sectional view of an upper section of the upper container half in the region of the drain 30 according to an eighth embodiment, Fig. 7f shows a perspective view of a thermostop agent of Fig. 7e, Fig. 7g shows a sectional view of the drain 30 and the thermostop means 80 according to a ninth embodiment, Fig.8a shows a sectional view of a portion of the upper container according to a tenth embodiment, Fig. Figure 8b shows a perspective view of the thermostop means of Fig. 8a, Fig. 8c and Fig. 8d each show a perspective view of the thermostop agent of Fig. 8, Fig. 8e shows a section in the area of ​​the inlet of the basic container with a thermostop agent, Fig. 8f until Fig. 8h each show schematic perspective views of the thermostop agent of Fig. 8e, Fig. 9 shows a sectional view of the drain 30 with a further thermostop means according to an eleventh embodiment, Fig. 10 shows a basic container 5 according to a twelfth embodiment, Fig.11 shows a perspective partial sectional view of a base container 5 according to the twelfth embodiment, Fig. 12 shows a sectional view of the membrane unit 90 according to the thirteenth embodiment, Fig. 13 shows a plan view of a Fig. 12 shown membrane unit 90, Fig. 14 shows a schematic representation of a section of the base container 5 in the region of the inlet 40 according to a thirteenth embodiment, Fig. 15 shows a perspective sectional view of the upper part of the membrane unit which is attached to the receiving chamber 70, Fig. 16a until 16d each show different views of a membrane unit according to a fourteenth embodiment, Fig. 17 shows a partial sectional view of a suction unit according to a fifteenth embodiment, Fig.18 shows another partial sectional view of the suction unit, Fig. 19 shows a perspective view of the suction unit of Fig. 17, Fig. 20 shows a perspective partial sectional view of a part of the inlet pipe according to the fifteenth embodiment Fig. Figure 21 shows a more detailed section of the base container in the area of ​​the opening 100, which connects the receiving chamber 70 with the inlet pipe, Fig. 22 shows a graph illustrating the response behavior of the water jet pump 126, Fig. 23 shows a graph illustrating the relationship between volume flow and flow pressure, Fig. 24 shows a graph illustrating the dependence of suction time and volume flow, Fig. 25a shows a limescale protection cartridge 110 according to the sixteenth embodiment, Fig.25b shows a perspective partial sectional view of the lower container shell 20, Fig. 26a and Fig. 26b show perspective views of a physical limescale protection unit 140 according to the seventeenth embodiment, Fig. 27a shows a schematic plan view of a base container according to the seventeenth embodiment, Fig. 27b shows a section of a perspective top view of the section of the upper container shell 10 in the area of ​​the inlet and the receiving chamber, Fig. 27c shows a further perspective view of the upper container shell 10 in the area of ​​the inlet 40, Fig. 28 shows a perspective partial sectional view according to an eighteenth embodiment, Fig. 29 shows a perspective view of the limescale protection unit 140, Fig.30 shows a sectional view of a base container according to a nineteenth embodiment, Fig. 31 shows a sectional view of a base container according to a twentieth embodiment, Fig. 32 shows a sectional view of a base container according to a twenty-first embodiment, Fig. 33 shows a sectional view of a base container according to a twenty-second embodiment, and Fig. 34 shows a sectional view of a base container according to a twenty-third embodiment, Fig. 35 shows a perspective view of a lower container half according to a further embodiment, Fig. 36 shows a perspective sectional view of the lower container half of Fig. 35, Fig. 37 shows a further perspective view of a section of the lower container half of Fig. 35, Fig. 38 shows a perspective view of a portion of the lower container half, Fig. 39 shows an enlarged sectional view in the area of ​​the inflow, Fig. 40 shows a sectional view of the inflow area and the lower area of ​​the lower half of the tank, Fig. 41 shows a sectional view of the lower half of the container, and Fig. 42 shows a schematic sectional view of the basic container of Fig. 41.

[0020] Fig.1 shows a sectional view of a base tank 5 for a water heater according to the first embodiment. The tank 5 preferably has an upper and a lower tank shell 10, 20, which are preferably welded to one another on the tank shell 15. The upper and lower tank shells 10, 20 are preferably produced from plastic using an injection molding process. The tank has an inlet 40 and an outlet 30. The inlet 40 is designed as an inlet pipe with a first upper part 41 and a second lower part 42. The first upper part 41 is attached to the upper tank half 10 and the second lower part 42 to the lower tank half 20. Thus, the first upper part 41 is preferably designed in one piece with the upper tank half and the second lower part 42 is designed in one piece with the lower tank half 20. The second lower part 42a of the inlet pipe, ieThe opening, i.e., the mouth, is designed such that the incoming water flows into the lower region of the second container half 20. In other words, the water flows into the lower region of the lower container half 20 at a low flow rate. The first upper part 41 is preferably pushed onto the second lower part 42 by means of a slight compression force. Alternatively, the pipe ends can also be welded together.

[0021] An opening 50 for a heating flange 60 is provided on the lower container half or container shell 20. A heating element 61 is attached to the heating flange 60 in such a way that the connections of the heating element 61 protrude outward.

[0022] The base container 5 further comprises a receiving chamber 70 for receiving additional components. The receiving chamber 70 is preferably cylindrical and arranged parallel to the upper part 41 of the inlet pipe 40. Alternatively, the receiving chamber can also be arranged concentrically around the inlet pipe.

[0023] Fig. Figure 2 shows a sectional view of the base container 5 according to a second embodiment. The base container 5 of the second embodiment corresponds in principle to the base container of the first embodiment, wherein the container according to Fig. 2 is designed as an over-sink hot water tank. For this purpose, the base tank 5 according to the first embodiment simply needs to be turned upside down and the inlet 40 is used as the outlet, while the outlet 30 is used as the inlet. The remaining design of the upper and lower tank shells 10, 20 corresponds to the embodiment of Fig.1. Only the heating element 61 must be designed differently in order to insert the heating coils deep into the base tank so that they can heat the water in the area of ​​the inlet 30. Furthermore, a thermo-stop device 80 can be arranged in the area of ​​the inlet 30. This thermo-stop device serves, among other things, to calm the inflowing water. A detailed description of the thermo-stop device 80 is given with regard to the Fig. 5a to 8h. The thermostop device preferably does not have a non-return valve.

[0024] Fig.Figure 3 shows a schematic sectional view of a water heater according to the third embodiment. The base tank 5 according to the third embodiment essentially corresponds to the base tank 5 according to the first embodiment. Only the receiving chamber 70 is not arranged next to the inlet pipe 41, but rather concentrically around the upper part 41 of the inlet pipe. The remaining structure of the base tank 5 according to the third embodiment thus corresponds to the structure of the base tank according to the first embodiment.

[0025] Fig. Figure 4 shows a base tank 5 for a water heater according to a fourth embodiment of the invention. The basic structure of the base tank 5 corresponds to the structure of the base tank 5 according to the first embodiment. According to the fourth embodiment of the invention, a thermostop means 80 (without a non-return valve 81) is arranged at the outlet 30.

[0026] The thermo-stop means 80 serves to collect gas bubbles that form and rise in the tank. In a typical under-sink water heater, a thermo-siphon system is formed together with the temperature control battery, whereby the heated stored water circulates between the tank and a fitting until rising gas bubbles from the tank interrupt the circulation by forming an air cushion. Conventional solutions for preventing such an air cushion provide S-shaped connecting pipes to create a siphon. However, connecting pipes designed in this way are generally not considered visually appealing. In other designs, an expensive screw-on thermo-stop is provided in the fitting.

[0027] The thermo-stop means 80 according to the fourth embodiment, however, is made of plastic. The thermo-stop means 80 has a locking hook for attachment to the inside of the drain 30 or in the area of ​​the drain 30.

[0028] Fig. Figure 5a shows a perspective sectional view of the outlet 30 and the thermo-stop means 80 according to a fifth embodiment. The thermo-stop means is inserted inside the area of ​​the outlet 30 of the base container 5 and has a coarse filter 82, a locking hook 84, a space between the outlet and the thermo-stop means 85, and an opening 86 in the coarse filter 82.

[0029] The thermostop means 80 is arranged in the outlet or drain 30 as already described above, wherein a space is provided in the outlet pipe or outlet area of ​​the container, which space is formed by an enlargement of the diameter of the outlet pipe. Additionally or alternatively, a horizontal or inclined connection can be provided between the highest zone inside the container and the hot water outlet to expel air bubbles. In the one-piece thermostop means, a constriction in the outlet pipe serves as an undercut for locking the thermostop means. The undercut represents a web, threaded part, or hook attached to the pipe. The undercut is formed by two mold cores arranged opposite one another. Alternatively, the container can be provided with at least one inwardly facing locking hook or a locking spring for holding the thermostop means.Preferably, the outlet pipe has an extension into which a thermal bell points or engages and forms part of a flow path of the siphon.

[0030] Fig. Figure 5b shows a perspective view of the thermostop device 80. The thermostop device 80 comprises a hollow cylindrical filter 82 with a valve body 81 arranged therein as a backflow valve. This backflow valve is only required for a container with drip reduction.

[0031] Fig. Figure 5c shows another perspective view of the thermostop device according to the fourth embodiment. The hollow-cylindrical coarse filter 82 can be closed by a drainage part 83.

[0032] The coarse filter 82 is designed in such a way that floating limescale lumps cannot enter the drain 30 and thus a connected fitting. Furthermore, the coarse filter prevents loosened limescale lumps from jamming the valve body 81.

[0033] Fig.6 shows a sectional view of a section of the upper housing half with an inlet or outlet 30 according to a sixth exemplary embodiment. The upper container half 10a has a tapered section 10b, to which the inlet or outlet 30 is connected. A fastening 10c for engaging a locking hook of a thermo-stop means is arranged in the transition between section 10b and the upper container half. Section 10a represents a bulge 35 compared to the upper container half 10. This bulge is preferably designed as a substantially vertical, oblique connection between the highest zone in the interior of the base container and the hot water outlet. Thus, air bubbles can be easily expelled through the outlet 30.

[0034] Fig.Fig. 7a shows a sectional view of a portion of the upper container half 10a according to a seventh embodiment, to which the outlet or inlet 30 is connected. As in Fig. 6, the inner diameter of section 10b tapers. A thermostop means 80 is at least partially inserted into this first section 10b, i.e., the thermostop means extends at least partially into the base container. The thermostop means 80 has a lower part 80c with two handles 80a and 80b, which are connected to a locking hook 80e, which is used to attach the thermostop means. By pressing the two handles 80a and 80b together, the locking hook 80e can be removed from the attachment 10c. The thermostop means has a further part 82, which is attached to the first part and has further locking hooks 84, which extend into the tapered section 10b.

[0035] Fig.Figure 7b shows a perspective view of the thermostop means of Fig. 7a. The lower part 80c has two handles 80a, 80b, which are connected to the locking hook 80e in such a way that when the two arms 80a, 80b are actuated, the locking hook 80e is bent outward. The lower part 80c further has two locking hooks 80f, which serve to receive the second part 82. The second part 82 serves as a coarse sieve and has four locking hooks 84 at its upper end for receiving a valve body. The first part and the second part are releasably connected to one another by the two snap hooks 80f.

[0036] Fig. Figure 7c shows a sectional view of a section of the upper half of the container in the area of ​​the inlet or outlet 30. This sectional view essentially corresponds to the sectional view of Fig.7a, wherein a valve body 81 is additionally arranged in the area of ​​the locking hooks 84. Thus, a non-return valve is formed by a spherical valve body. Fig. The variant shown in Figure 7c is preferably used in a water heater with drip reduction, especially if the membrane unit is according to Fig. 12 to 16d is used.

[0037] Fig. 7d shows a perspective view of the thermostop means 80. Here, the design of the thermostop means according to Fig. 7d essentially the design of the thermostop agent according to Fig. 7b. In addition, however, the valve body is provided in the form of a spherical valve body 81, which is to be held by the locking hooks.

[0038] Fig.7e shows a sectional view of a section of the upper container half 10 in the area of ​​the inlet or outlet 30. Here, the design of the upper section 10b, 10c corresponds to the design of the upper section according to Fig. 7a or Fig. 7c. The design of the thermostop means 80 according to Fig. 7e essentially corresponds to the design of the thermostop agent according to Fig. 7c. However, instead of a number of locking hooks 84, a continuous edge 84 is provided in the upper region of the second part of the thermo-stop device. This embodiment of the thermo-stop device also shows a non-return valve, which is designed as an umbrella valve.

[0039] Fig. 7f shows a perspective view of the thermostop means 80. Here, the thermostop means 80 corresponds to Fig. 7f essentially the thermostop agent according to Fig.7d, wherein the thermostop means does not have locking hooks, but rather an upper edge 84a into which the non-return valve 81a can be inserted. The non-return valve 81a is preferably used in a water heater that also has a drip reduction device, for example, with the membrane unit 90.

[0040] Fig. Figure 7g shows a perspective sectional view through an outlet 30 with a thermo-stop means 80 arranged therein, according to the fourth embodiment. The thermo-stop means 80 is secured in the outlet 30 with the locking hooks 84. The locking hooks 84 in the upper area of ​​the thermo-stop means 80 serve only to hold the valve body 81. They ensure that the valve body does not fall out of the plastic part 82 during assembly. The locking hook for securing the thermo-stop means 80 is in Fig. 7g not shown.

[0041] The draining water flows from T1 into a space 85 between the outlet 30 and the thermal stop medium 80 (T2) and from there via the coarse filter 82 into the interior of the coarse filter (T3), before flowing back up again (T4), as the downward path is blocked by the end piece 83. The water then flows upward through the outlet 30 (T5). Rising gas bubbles collect in the thermal stop medium 80, which is designed as a siphon, and interrupt the thermal circulation. The water temperature in area T5 is then significantly lower than in container T1. In the upper area, the thermal stop medium 80 has fastening hooks 84 for holding a valve body 81. The valve body, in conjunction with the plastic part 82, forms a backflow valve, which is required to reduce dripping. When the thermal circulation is interrupted, the valve body is located in the cooler water area T5, thus reducing limescale buildup on the valve body.

[0042] Fig.8a shows a sectional view of a section of the upper container in the area of ​​the drain according to a tenth embodiment. Also shown here is a thermostop device 80 without a non-return valve. The inner diameter of section 10b tapers toward the drain 30. The thermostop device is at least partially inserted into this section 10b. The lower end of the thermostop device thus extends into the base container. The thermostop device is hooked into the fastening 10c by means of a locking hook 80e. A rib 80r is arranged on the locking hook 80e, wherein the locking hook 80e can be removed from the fastening 10c by pressing the rib, so that the thermostop device can be removed. To improve the tightness of the thermostop device, an O-ring 80m is provided. The thermostop device according to the tenth embodiment has a substantially hollow-cylindrical filter 82d, which is integrally connected to a locking hook.The lower section of the thermo-stop device is closed by a cover 80s, forming a flow channel that can function as a siphon. The thermo-stop device can be removed by pressing the locking hook 80e while simultaneously pulling on the rib 80r.

[0043] Fig. Figure 8b shows a perspective view of the thermostop means of Fig.8a. The thermostop means essentially consists of the hollow cylindrical filter 82d and the closure lid 80s. The closure lid 80s has two locking hooks 80q, by means of which the lid 80s can be attached to the hollow cylindrical filter 82d. A coarse filter 82e is arranged on the hollow cylindrical filter 82d, which is intended to prevent large pieces of lime from entering the thermostop means. While the closure lid 80s is attached to a first end of the thermostop means, a hollow cylindrical section 82f is located at the second end of the thermostop means. The hollow cylindrical element 82f has a window 82g. The locking hook 80e and the rib 80r are arranged at the first end of the thermostop means.

[0044] To keep large limescale lumps away from the coarse filter 82e, a comb-like pre-filter 80p is arranged in front of the coarse filter 82e. This prevents the chamber between the pre-filter 80p and the coarse filter 80e from becoming clogged with limescale lumps.

[0045] Fig. 8c and Fig. 8d each show a further perspective view of the thermostop means of Fig. 8a. The thermostop device consists of two parts, namely the closure cover 80s and the hollow cylindrical filter element 80d. At one end of the hollow cylindrical filter element 82d, another hollow cylindrical element 82f with at least one window 82g is arranged. A coarse filter 82e is also arranged at this end.

[0046] Fig. Figure 8e shows a section of the inlet of the base tank with a thermo-stop device. The thermo-stop device has a non-return valve. As already shown in Fig.8a, the section 10b tapers in the area of ​​the inlet 30. The design of the thermostop means according to Fig. 8e essentially corresponds to the design of the thermostop device according to the Fig. 8a to 8d. In addition, a valve body with an umbrella valve is inserted into the hollow cylindrical element 82f.

[0047] In the Fig. 8f to 8h are schematic perspective views of the thermostop means of Fig.8e. In particular, the valve body 80t with the umbrella valve is also shown. The valve body has at least two guide ribs 80y and two locking hooks 80x. The two locking hooks 80x are designed such that they engage in the openings or windows 82g when the valve body is inserted into the hollow cylindrical element 82f. The guide ribs 80y serve to insert the valve body into the hollow cylindrical element in an appropriately aligned manner. Thus, a non-return valve is locked into the thermostop valve. The lateral guide ribs 80y of the valve body allow the valve body to be inserted into an advantageous position in the hollow cylindrical element 82f.

[0048] The Fig. 5a to 5c, 7a to 7g, 8a to 8g and Fig.The embodiments of the thermostop means shown in Figure 9 can be implemented in any basic container, so that the thermostop means is not limited to embodiments with the basic containers shown here.

[0049] The thermo-stop device shown in these exemplary embodiments thus has a locking hook, by means of which the thermo-stop device can be attached to the base container. Alternatively, however, the thermo-stop device can also be implemented without a locking hook, provided that it can be securely attached in the area of ​​the drain. In this case, the thermo-stop device should be designed such that it partially protrudes into the drain and partially into the base container. This is particularly advantageous in that the thermo-stop device can also be disassembled and replaced for repair.

[0050] Fig.Figure 9 shows a sectional view of the drain 30 with a further thermo-stop means according to an eleventh embodiment. The draining water flows from the side towards the thermo-stop means 80 (T10) and then flows upwards into the intermediate space 85 between the drain 30 and the thermo-stop means (T11). When the outflowing or draining water reaches the upper end of the intermediate space 85 (T12), it flows down into a space in the thermo-stop means 80 (T13), then flows upwards through openings in the lower region of the thermo-stop means (T14) through an opening located in the center of the thermo-stop means 80 (T15, T16), and then finally flows out of the drain 30 (T17). In the one-piece thermo-stop means according to Fig.9, a constriction in the outlet pipe serves as an undercut for locking the thermo-stop means. The undercut represents a web, threaded part, or hook mounted in the pipe. The undercut can be formed by two mold cores arranged opposite one another. Alternatively, the container can be provided with at least one inwardly facing locking hook or locking spring for holding the thermo-stop means. Preferably, the outlet pipe has an extension into which a thermo-bell points or engages, forming part of the flow path of the siphon.

[0051] The design of the thermostop means 80 is such that a siphon is integrated into the base container. Rising gas bubbles collect in the areas T11, T12, and T13 and interrupt the thermal circulation.

[0052] Fig.10 shows a basic container 5 according to a twelfth embodiment. The basic structure of the basic container 5 essentially corresponds to the structure of the basic container according to the first embodiment. Thus, the basic container has an upper container shell 10 and a lower container shell 20, which are connected to one another by a weld seam 15. The first upper part 41 of the inlet pipe 40 is integrally connected to the upper container shell 10, while the second lower part 42 of the inlet pipe is integrally connected to the lower container shell 20. An opening 100 is provided between the upper part 41 of the inlet pipe and the receiving chamber 70. A thermostop means 80 can optionally be arranged at the outlet 30. The thermostop means 80 is preferably as shown in the Fig.5a to 5c, ie the thermostop means 80 preferably has a non-return valve (this also applies to the embodiments in Fig. 7c-7f). A membrane unit 90 is arranged in the receiving chamber 70. A limescale protection cartridge 110 is optionally arranged in the lower region of the lower container shell 20. Furthermore, a suction unit 120 can be arranged in the inlet pipe, particularly at the transition between the first and second parts 41, 42.

[0053] Fig. 11 shows a perspective partial sectional view of a base container 5 according to the thirteenth embodiment. Thus, a thermostop device 80 (with non-return valve) is optionally arranged in the outlet 30, and a lime cartridge 110 is optionally arranged in the lower region of the lower container shell 20. Furthermore, the base container has a membrane unit 90 in the receiving chamber 70, and a suction unit 120 is arranged in the inlet pipe 40.

[0054] The membrane unit 90, which is arranged in the receiving chamber 70, serves to reduce dripping and thus represents a drip-reducing unit. Thus, a water heater with a basic container shown, for example, in the first to fourth embodiments can be upgraded by adding a membrane unit or a drip-reducing unit 90 in the receiving chamber 70. This proves particularly advantageous in that the basic container is constructed identically for different embodiments, so that a larger number of units can be manufactured. In order to implement drip reduction using the membrane unit 90 in accordance with the basic container 5, an opening 100 must be provided between the inlet pipe and the receiving chamber 70.This can be realized, for example, by a slide in the region of the opening 100, so that the basic container can also be used for the embodiments shown in the first to fourth embodiments.

[0055] Before the upper and lower container shells 10, 20 are welded together, thus fitting the upper part 41 into the lower part 42 of the inlet pipe, a suction unit 120 is inserted as a pre-assembled subassembly. The suction unit preferably comprises a water jet pump with a parallel bypass valve, a backflow valve, and a filter.

[0056] The membrane unit 90 is inserted into the receiving chamber 70 as already described above, which is connected to the inlet pipe through the opening 100.

[0057] Fig.12 shows a sectional view of the membrane unit or drip reduction unit 90 according to the thirteenth embodiment. The membrane unit 90 comprises a membrane holder 94 with a substantially cylindrical membrane 91 arranged thereon. The membrane is secured to the membrane holder 94 by means of a molded-on seal 93. The membrane holder 94 has a hollow-cylindrical part 96, which extends substantially parallel to the cylindrical membrane. The membrane holder 94 further comprises a check valve 92 and a vent opening 95.

[0058] Fig. 13 shows a plan view of a Fig.12. Here, the membrane unit or drip reduction unit 90 has locking hooks 96 for appropriate attachment to the base container. The thin, elongated membrane 91, which is attached to the membrane holder 94, serves as a reservoir for the expansion water. Because the membrane is flexible and only contains air inside, the membrane can be compressed to a certain extent, thereby increasing the volume for water flowing in through the opening 100.

[0059] Fig.Figure 14 shows a schematic representation of a section of the base container 5 in the area of ​​the inlet 40 according to the thirteenth embodiment. Here, the inlet 40 and the membrane unit or drip reduction unit 90 can be seen. The locking hooks 96 of the membrane holder 94 can hook into a groove 97 at the upper edge of the receiving chamber 70, so that the membrane unit 90 can be securely attached to the receiving chamber 70.

[0060] Alternatively, the membrane holder can also be screwed onto the container.

[0061] Fig. Figure 15 shows a perspective sectional view of the upper part of the membrane unit or drip reduction unit, which is attached to the receiving chamber 70. The membrane is attached to the receiving chamber 70 by the membrane holder 94.

[0062] Fig.16a to 16d show various views of a membrane unit and the drip reduction unit 90 according to a fourteenth embodiment. In Fig. 16a shows three sectional views of a membrane 91. The membrane according to the Fig. 16a to 16d is characterized by the fact that it has several ribs 90a, i.e., several ribs are molded onto the membrane. The ribs serve to ensure that the membrane 91, or rather the thin membrane skin, can lie flat and without kinking, thus preventing damage to the thin membrane due to constant deformation.

[0063] Fig. Figure 16b shows a perspective view of the diaphragm and the diaphragm holder. In this illustration, the rib 90a is clearly visible.

[0064] Fig.Figure 16c shows a sectional view of the membrane unit 90 with the membrane 91, the membrane holder 94, and a preferably circumferential rib 90a. The membrane holder 94 has a vent opening 95 and a check valve 92.

[0065] Fig. 16d shows a perspective view of the membrane 91 with the membrane holder 94. The membrane holder 94 has a vent opening 95 and a plurality of locking hooks 96.

[0066] The components to be mounted in or on the base container 5, such as the thermostop agent 80, the membrane unit 90, the lime cartridges 110 and 140 or the suction unit 120, are each prefabricated as assemblies so that they can be easily inserted during assembly, for example by an assembly robot.

[0067] The drip reduction according to the twelfth, thirteenth, and / or fourteenth embodiments using the membrane unit or the drip reduction unit 90 is based on the consideration that a space for expansion water must be created in the reservoir during tapping. This space or reservoir for the expansion water should preferably be arranged such that at least part of the cylindrical area is also located in the container. Expansion water collects between the wall of the receiving chamber 70 and the membrane 91 of the membrane unit or the drip reduction unit 90. This ensures that the expansion water in the reservoir is heated by the storage water, thus preventing germ formation. To ensure that the entire reservoir can be drained during a tapping process, the opening 100 is provided at the bottom of the receiving chamber 70.A suction unit 120 is arranged at the lowest point of the reservoir so that maximum suction power can be achieved even at a low volume flow.

[0068] The incoming cold water is first filtered in the storage inlet 40 through the replaceable filter 130, which is arranged in the inlet 40. The water then flows through the suction unit 120 with a corresponding water jet pump and empties the reservoir via the opening 100, i.e. the membrane 91 expands again. For this purpose, a minimum volume flow of approximately 0.5 l / min. is preferably provided by the water jet pump. To provide a larger volume flow, a bypass valve provided parallel to the water jet pump can be opened. After completion of a tapping process, the backflow valves in the inlet 125 and in the outlet 81 ensure that the water column in the fitting does not flow back into the storage tank and that the reservoir between the membrane 91 and the receiving chamber 70 refills.

[0069] This ensures that the reservoir between the diaphragm and the receiving chamber 70 only fills with expansion water and compresses the thin diaphragm 91 when the water in the container is heated. Thus, the water remains in the system and does not come into contact with air. If the diaphragm 91 leaks, the check valve 92 in the diaphragm holder 94 prevents water from escaping.

[0070] Since the suction unit 120 cannot be easily replaced, all openings of the suction unit are provided with dirt filters.

[0071] The check valve 81 in the thermostop device 80, which is located in the outlet 30 of the container, serves to prevent the storage tank and the reservoir from being filled via the outlet 30. If this occurs during the heating phase, drops may form on the fitting.

[0072] A non-return valve is also provided in the inlet 40 to prevent the water column from sinking in the faucet after tapping. If this is not prevented, the connecting pipes will fill with air, which will be forced into the storage tank when the water is drawn again, resulting in suction noise and a reduced amount of mixed hot water.

[0073] The check valves must meet the following requirements. Inflow Sequence Opening pressure: 800 mm WS small Closing pressure 750 mm WS 400 mm WS Leakage rate 0 ml 0 ml Pressure difference at 5l / min 0.1ba 0.1 bar Volume flow 0.3 - 7 l / min 0.3 - 7 l / min Closing speed fast fast The valve body must not clamp or stick If the valve is turned by 120° it must open automatically

[0074] When expansion water flows through opening 100, diaphragm 91 compresses without pressure, allowing the air contained in diaphragm 91 to escape through vent opening 95. If the diaphragm fails, check valve 92 prevents water from escaping. A floating ball closes the vent opening. Seal 93 is preferably designed as an O-ring and thus seals against the container.

[0075] The Fig. The membrane unit shown in Figures 12 to 16c can be installed in the basic containers according to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 10, Fig. 30, Fig. 31, Fig. 32, Fig. 33 and Fig. 34. However, it should be noted that the membrane unit is designed according to the Fig. 12 to 16 is not limited to the use of such basic containers.

[0076] Fig.17 shows a partial sectional view of the suction unit 120 according to a fifteenth embodiment. Since the suction unit 120 cannot be easily replaced, corresponding filters are provided at all openings of the suction unit. Thus, the suction unit has a first filter 121, a second filter 123, and a third filter 124. Furthermore, the suction unit has a water jet pump 126 and a bypass valve 122 arranged parallel thereto. Furthermore, the suction unit has a valve 125 that opens when an opening pressure threshold is reached, e.g., an RV cartridge 125, for example, Neoperl.

[0077] The water jet pump 126 is designed such that suction begins at < 0.5 l / min. The water jet pump is also designed to suction at a low pressure of 0.1 - 0.5 bar upstream of the water jet pump 126. Furthermore, the water jet pump 126 is insensitive to backpressure and can achieve a large suction flow rate. Due to the low back pressure upstream of the water jet pump 126 (approx. 1.2 bar at 5 l / min), the feedback on the temperature control behavior of the fitting is minimal. The opening pressure for the bypass valve 122 is approximately 1 bar. 5 l / min of hot water can be achieved at a flow pressure of 2.8 bar at the angle valve.

[0078] For nozzles with a diameter of < 1.4 mm, the temperature control of the fitting deteriorates due to the higher back pressure in front of the suction unit 120. At the same time, the maximum hot water volume flow is reduced.

[0079] Fig.Figure 18 shows another partial sectional view of the suction unit 120. The suction unit has a filter 121, 124 at each of its two ends. The bypass valve 122 is provided with a spring 127, which preloads the bypass valve accordingly.

[0080] Fig. Figure 19 shows a perspective view of the suction unit 120. It can be seen that a filter 123 is arranged in front of the suction opening. A receptacle 128 for a robot is provided at the left end of the suction unit.

[0081] Fig.Figure 20 shows a perspective partial sectional view of a portion of the inlet tube. The membrane unit 90 with the membrane 91 is arranged in the receiving chamber 70. The suction unit 120 is arranged in the first part 41 of the inlet tube. An opening 100 is provided between the inlet tube and the receiving chamber 70. The suction unit has first, second, and third filters 121, 124, and 123. The spring 127 for the bypass valve can also be seen.

[0082] Fig. Figure 21 shows a more detailed section of the base container in the area of ​​the opening 100, which connects the receiving chamber 70 to the inlet pipe. The membrane 91 is shown in the receiving chamber. Furthermore, the suction unit 120 is shown in the inlet pipe.

[0083] The Fig. The suction unit shown in Figures 17 to 21 can be implemented in any basic container, provided that the basic container has an inlet pipe.

[0084] Fig. Figure 22 shows a graph illustrating the response behavior of the water jet pump 126 when using a temperature control valve as an example (this graph only applies to the use of a specific temperature control valve). The volume flow in liters per minute is plotted on the Y-axis and the angular position of the mixing valve is plotted on the X-axis. At an angular position of 60°, a tapping volume flow V max (P F = 4 bar) = 7.5 l a cold water portion of V KW (P F = 4 bar) = 3.6 l are added. If the tapping volume flow drops to 1.5 l / min at an angle of 60°, the suction limit of the water jet pump 126 is reached, and the pump no longer suctions. If the tapping is below the suction limit for a longer period, dripping may occur, as the volume flow through the storage tank is below the suction limit of 0.5 l / min. The progression of the cold water portion V KW (P F= 4 bar) indicates a suitable control characteristic of the valve. In Fig. 23 corresponds to P F the flow pressure at the angle valve. V KW corresponds to the volume flow of the cold water portion, and V max corresponds to the maximum tapping volume flow of the temperature control valve.

[0085] Fig. Figure 23 shows a graph illustrating the relationship between volume flow and flow pressure. The flow pressure in bar is plotted on the Y-axis and the volume flow in liters per minute on the X-axis. As shown in Fig. As shown in Figure 23, satisfactory control behavior is achieved when adjusting the mixed water temperature, as the draw-off flow rate changes only slightly. Here, the change is only between 5 and 6.25 l / min.

[0086] Fig.Figure 24 shows a graph illustrating the relationship between suction time and flow rate. The suction time in seconds is plotted on the Y-axis, and the flow rate in liters per minute is plotted on the X-axis. Specifically, the suction time is plotted for 100 ml. Starting at a flow rate of approximately 1 l / min, the suction volume is essentially constant, independent of the hot water flow rate.

[0087] Fig.Figure 25a shows a limescale protection cartridge 110 according to a sixteenth embodiment. The limescale protection cartridge 110 comprises a lower container 111 and a lid 112. Both the lid and the containers 111, 112 are designed as sieves with a slot width of preferably 0.3 mm. The volume of the limescale protection cartridge is preferably 200 ml. The limescale protection cartridge 110, filled with catalyst granules, is arranged on the container bottom concentrically to the heating element 61. The container 111 and the lid 112 can be welded. By designing the cartridge as a sieve, the granules are effectively washed by the incoming cold water and the convection flow during heating.

[0088] Fig.Figure 25b shows a perspective partial sectional view of the lower container shell 20. A heating flange 60 is screwed to the opening 50. A heater 61 is connected to the heating flange. The limescale protection cartridge 110 is snapped into the lower container shell 20. This means that the limescale protection cartridge 111 must be installed before the upper and lower container shells 10, 20 are welded together.

[0089] The Fig. 25a and Fig. The limescale protection cartridge 110 shown in Figure 25b can be used in all previously described embodiments of the basic container. For example, the limescale protection cartridge 110 can be used in the container according to Fig. 1, according to Fig. 3 and pursuant to Fig. 4. Although in the Fig. 25a and Fig.25b shows a round limescale protection cartridge, the limescale protection cartridge can also be polygonal. The use of the limescale protection cartridge according to the Fig. 25a and Fig. 25b is not limited to use in the basic containers shown here, but the limescale protection cartridge 110 can be used in any basic container.

[0090] Fig. 26a and Fig. 26b show perspective views of a physical limescale protection unit 140 according to a seventeenth embodiment. This limescale protection unit 140 is designed such that it can be inserted into the receiving chamber 70.

[0091] The limescale protection unit 140 is designed in two parts and thus has a lid 142 and a cylindrical container 143. The volume of the cylindrical container or the limescale protection unit is preferably designed such that 100 to 150 mm of catalyst granules can be accommodated in the limescale protection unit. The limescale protection unit 140 is designed as a limescale protection cartridge, and the catalyst granules are inserted into the cylindrical container area 143 in a tight and pressure-tight manner.

[0092] Both the lid 142 and the cylindrical container 143 have a sieve with slots that are a maximum of 0.3 mm wide. To prevent the preferably fine-grained limescale protection material from falling out of the cartridge, the cartridge lid 142 and the cartridge closure have a sieve 141. The cartridge closure 142 is preferably made of plastic. The sieve 141 in the cartridge closure is preferably designed as part of an extended inflow channel.

[0093] At one end, the cylindrical container 143 also has a sieve with slots that are a maximum of 0.3 mm wide. The above-described design of the cartridge unit 140 enables easy filling and closing of the cartridge. The cartridge closure 142 and the cylindrical container 143 are preferably locked together. This locking can be achieved, for example, via snap hooks or a bayonet lock.

[0094] With the above-described design of the physical limescale protection unit 140, limescale protection can also be implemented for small storage tanks. Because the limescale protection unit 140 can be inserted into the receiving chamber 70, automatic cartridge assembly is also possible.

[0095] When the limescale protection unit 140 is inserted into the receiving chamber, the suction unit 120 draws the water in contact with the limescale protection material from the cartridge into the container 5 through an opening 100 between the inlet pipe 41 and the receiving chamber 70 when tapping. To allow warm water to continue flowing while the suction unit 120 is working, an opening 155 is provided in the upper area of ​​the container, which opens into the receiving chamber. Thus, warm water always flows through the limescale protection material from top to bottom. This is particularly advantageous because the effectiveness of the limescale protection agent is greatest with hot water.

[0096] The Fig. 26a and Fig. The limescale protection unit shown in Figure 26b is not limited to use in the basic containers shown here, but the limescale protection unit can be used in any basic container.

[0097] The Fig.Figure 27a shows a schematic plan view of a base container according to a seventeenth embodiment. The base container is designed essentially like the base container according to the first embodiment. Thus, the base container has an upper and lower container shell 10, 20, which are welded together. Furthermore, the container has an inlet 40 and an outlet 30 as well as a receiving chamber 70. In the area of ​​the outlet 30, a bulge 35 is provided from the upper end of the upper container shell 10. This bulge serves to transport air bubbles into the thermostop means 80. The bulge 35 is preferably designed as a horizontal, inclined connection between the highest zone inside the base container and the hot water outlet 30. This is particularly advantageous for conveying air bubbles out. Such a bulge 35 is also shown in Fig. 6 available.

[0098] Fig.Figure 27b shows a section of a perspective top view of the section of the upper container shell 10 in the area of ​​the inlet and the receiving chamber. A channel 150 extends from the upper area of ​​the receiving chamber 70 to the upper container shell 10, through which warm water can flow from the container into an upper end of the receiving chamber 70.

[0099] Fig. Figure 27c shows a further perspective view of the upper container shell 10 in the area of ​​the inlet 40. Here, an opening 155 of the channel 150 can be seen, through which warm water can flow into the receiving chamber 70. This is particularly advantageous when a limescale protection unit 140 is inserted into the receiving chamber 70, so that the heated water can flow downward from above through the limescale protection unit, to then be sucked away by the suction unit through the opening 100.

[0100] Fig.Figure 28 shows a perspective partial sectional view of a base container according to an eighteenth embodiment. Here, a limescale protection unit 140 is arranged in the receiving chamber 70. Furthermore, a replaceable filter 130 is arranged in the region of the inlet 40. A suction unit 120 is also provided in the inlet pipe 40. The suction unit 120 sucks water from the receiving chamber 70 through the opening 100. Thus, the water from the limescale protection unit 140 is sucked in by the suction unit 120 and discharged downward through the inlet pipe.

[0101] Fig.Figure 29 shows a perspective view of the limescale protection unit 140. As already described above, the limescale protection unit has a limescale protection closure or lid 142 and a cylindrical container 143. A sieve is provided in both the lid and the container so that water can flow from above through the lid into the cylindrical container and then back through the sieve 41. A locking mechanism 146 is provided to connect the lid and the cylindrical container, which can be implemented, for example, by a snap hook.

[0102] The limescale protection cartridge 110 described above can be integrated into any of the above embodiments. An alternative limescale protection solution is described in Fig. 31 shown.

[0103] Fig. Figure 30 shows a sectional view of a base container according to a nineteenth embodiment of the invention. Above the base container 5 according to this embodiment, the outwardly open receiving chamber 70 is arranged in the lower container part 20. As in the first embodiment of Fig. 1, the container has an upper container half 10 and a lower container half 20. Furthermore, an inlet 40, which has a first and second section 41, 42, and an outlet 30 are provided. The second section 42 has an opening 42a, which opens into the lower region of the lower container half 20. A heating flange 60 with a heating element 61 is provided in the lower container half 20.

[0104] Fig. Figure 31 shows a sectional view of a base container according to a twentieth embodiment. The structure of the base container according to this embodiment essentially corresponds to the structure of the base container according to Fig. 10. However, in the embodiment of Fig. 10, the receiving chamber 70 is arranged on the upper container half 10, according to this embodiment, it is arranged in the lower container half. A suction unit 120 is arranged in the second section 42 of the inlet pipe 40 (in the area of ​​the mouth 42a). A resealable opening 100 is provided in the area between the suction unit and the membrane unit. The suction unit 120 essentially corresponds to the Fig. Suction unit 120 shown in Figures 17 to 21.

[0105] Fig. 32 shows a sectional view of a base container 5 according to a twenty-first embodiment. The container 5 has an upper container half or container shell 10 and a lower container half 20. Furthermore, an inlet pipe 40 with a first and second section 41, 42 and an outlet 30 are provided. A receiving chamber 70 is provided between the first section 41 and the outer wall of the upper container half. On the lower container half 20, a receptacle 25, for example in the form of an O-ring groove, is provided for a membrane unit. On the upper container half, the receiving chamber 70 is provided for receiving, for example, the membrane.

[0106] Fig. Figure 33 shows a sectional view of a base container according to a twenty-second embodiment of the invention. The base container has an upper half 10 and a lower half 20. The base container according to Fig. 34 essentially corresponds to the basic container according to Fig. 32.

[0107] Additionally, a thermostop means 80 is arranged in the area of ​​the outlet 30, and a membrane unit 90 is arranged in the receiving chamber 70. In this embodiment, no separate membrane holder is present, since the membrane holder, including the membrane ventilation opening 100a, is integrally formed on the lower container half 20. A receiving chamber 70 is provided in the upper container half 10.

[0108] Fig. 34 shows a sectional view of a base container according to a twenty-third embodiment. The structure of Fig. 34 essentially corresponds to the structure of Fig. 33 and represents a situation during which the lower and upper container halves are assembled.

[0109] A further embodiment of a basic container is explained below.

[0110] An overflow curve indicates the temperature profile of the hot water flowing out of the storage tank during tapping. The aim is for water at the storage temperature to flow out for as long as possible when tapping, and for cold water to only flow out once the hot water has been drawn. The overflow curve should therefore fall as steeply as possible and not decrease gradually. For this to happen, the incoming cold water must stratify below the hot water in the storage tank. A violent inflow can lead to the cold water mixing with the hot water, meaning the desired stratification is not achieved. The water velocity at the outlet of the inflow area must therefore be as low as possible. A partial core flow with a higher flow velocity should also not develop.

[0111] The goal was to achieve an optimal overflow curve for a sprayed-in tank in a cost-effective design. No additional components were to be used to calm the incoming water.

[0112] Fig. Figure 35 shows a perspective view of a lower container half according to a twenty-fourth embodiment of the invention. Next to the opening 50, which serves to accommodate the heating flange 60, an inflow area or a baffle 22 extends from the surface of the lower container half 20.

[0113] This can be achieved with an injection-molded plastic container by first directing the cold water into a lower inflow area or a baffle 22 before reaching the outlet. The momentum of the incoming water is initially broken in the baffle. The baffle 22 can also be considered a damping element in the flow channel.

[0114] Fig. 36 shows a perspective sectional view of the lower container half according to Fig. 35. Here, the opening 50 and the wall of the lower container half 20 can be seen again. The second section 42 of the inlet pipe 40 extends to the inlet area or impact pot 22e. Preferably, both the lower container half 20 and the inlet area 22 and the second section 42 are formed as a single piece.

[0115] Fig. 37 shows a further perspective view of a section of the lower container half 20. In particular, the second section 42 with the inflow region 22 is shown. In the region of the transition between the second section 42 and the inflow region, a first wall W1 is arranged, which is arranged substantially perpendicular to the longitudinal axis of the second section 42. A rib 22a and a further wall W3 are arranged perpendicular to the first wall W1 and aligned with the second section 42.

[0116] Fig. 38 shows a perspective view of a section of the lower container half. This shows the second section 42 of the inlet pipe 40 and the bulge of the inlet region 22. A first wall W1 is arranged substantially perpendicular to the longitudinal direction of the second section 42. A further wall W4 is arranged perpendicular to the first wall W1, so that the cross-section of the walls W1 and W4 is configured as an inverted U. A second wall W2 has openings 22b. Further openings 22c are also present.

[0117] The second wall W2 has openings 22d, which are arranged in the lower region of the second section 42 of the inlet pipe 40 above the impact pot. The calmed main volume flow flows laterally through the openings 22d against the fourth wall W4. At the fourth wall W4, the flow momentum is broken again, and the water is redirected at low velocity to the outlet of the inlet area. Thus, the walls W1, W3, and W4 form a channel opening towards the center of the reservoir. Part of the water flows at low velocity through the openings 22b in the wall W2 and the rearward-facing openings 22c in the wall W3. The openings 22b can also prevent a dead water area from forming in front of the wall W2. The water flowing through the openings 22c is directed into the reservoir behind the wall W3. The total volume flow is divided by the openings 22d, 22b, and 22c.Thus, each of the openings contributes to reducing the flow velocity at the outlet of the inlet area. The cross-section of the main opening 22d is designed such that the opening 22d cannot become clogged with dirt or limescale.

[0118] Part of the inflow area is the vertical cylindrical wall W5. The inflowing water initially collects in the cylindrical area formed by wall W5. The directed flow from the inflow channel is deflected and thus calmed by wall W5.

[0119] Thus, the container has an inflow. A wall W2 is arranged in the flow channel, and another vertical wall W5 is also provided.

[0120] Preferably, the impact pot 22e is located lower than the opening 22d. The inflow area is preferably designed as a single piece.

[0121] Fig. Figure 39 shows an enlarged sectional view of the inflow area. The water first flows from S1 into the impact pot 22e and then through openings 22d and 22b into the pot S3. The second wall is oriented substantially in the longitudinal direction of the second section, while the first wall is oriented perpendicular to the longitudinal direction of the second section 42.

[0122] Fig. 40 shows a sectional view of the inflow and the lower region of the lower tank half. Here, water flows through the second section 42 of the inflow pipe 40 into the impact pot 22e. The water flows through the openings 22d into the lower region of the lower tank half. A second wall 2 is arranged in the region of the second section 42, directed toward the interior of the tank. The third wall W3 has openings 22c.

[0123] Fig. 41 shows a sectional view of the lower tank half 20. The second section 42 of the inlet pipe and the inlet 22 are preferably formed integrally with the lower tank half 20. The water flows (S1) through the second section 42 into the impact pot 22e (S2). From the impact pot, the water flows through the opening 22d into the lower region of the lower tank half (S3). A circumferential horizontal wall W5 is preferably formed on the tank bottom, providing an inlet region for calming the inflowing water.

[0124] Fig. 42 shows a schematic sectional view of the basic container of Fig. 41.

[0125] In the embodiments described above, the base container is implemented by two horizontally welded container shells. Alternatively, however, the base container can also be implemented by two vertically welded container shells.

Claims

[1] Water heater, with a base container (5) for holding water, which an inlet (40) for water to be heated, a drain (30) for heated water, and has an outwardly open receiving chamber (70) for the exchangeable accommodation of system components, wherein the base container (5) has a first container half (10) and a second container half (20), wherein the inlet (40) is designed as an inlet pipe which has a first section (41) and a second section (42), wherein the first section (41) is connected to the first container half (10) and the second section (42) is connected to the second container half (20), wherein the outwardly open receiving chamber (70) is connected to the first or second container half (10, 20), wherein the first and second sections (41, 42) of the inlet pipe (40) are inserted into one another and / or welded together, wherein the second section (42) of the inlet pipe (40) ends in the lower region of the second container half (20) and has an opening (42a), wherein an inflow area (22) is arranged in the lower area of ​​the base container, which is connected to the inlet (40), wherein in the region of the transition between the second section (42) and the inflow region (22) a first wall (W1) is arranged, which is arranged perpendicular to the longitudinal axis of the second section (42), wherein a fourth wall (W4) is arranged perpendicular to the first wall (W1), so that the cross section of the walls (W1, W4) is designed as an inverted U, wherein a second wall (W2) is arranged in the inflow region (22) in the longitudinal direction of the second section (42), and wherein the second wall (W2) has openings (22b), wherein a third wall (W3) is arranged in the inflow region (22) parallel to the second wall (W2), and wherein the third wall (W3) has openings (22c), wherein the first, third and fourth walls (W1, W3, W4) form a flow channel opening towards the center of the storage tank and the second wall (W2) is arranged in this flow channel. [2] Water heater according to claim 1, wherein the inlet (40) and the inflow area (22) are integrally connected to the base container (5). [3] A water heater according to claim 1, wherein the inflow region (22) has a baffle (22e) extending out from a surface of the second container half (20). [4] Water heater, with a base container (5) for holding water, which has an inlet (40) for water to be heated, a drain (30) for heated water, and has an outwardly open receiving chamber (70) for the exchangeable accommodation of system components, wherein the base container (5) has a first container half (10) and a second container half (20), wherein the inlet (40) is designed as an inlet pipe which has a first section (41) and a second section (42), wherein the first section (41) is connected to the first container half (10) and the second section (42) is connected to the second container half (20), wherein the outwardly open receiving chamber (70) is connected to the first or second container half (10, 20), wherein the first and second sections (41, 42) of the inlet pipe (40) are inserted into one another and / or welded together, wherein the second section (42) of the inlet pipe (40) ends in the lower region of the second container half (20) and has an opening (42a), wherein the receiving chamber (70) is arranged adjacent to the first section (41) or around the first section (41), or wherein the receiving chamber (70) is arranged adjacent to the second section (42) or around the second section (42).

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