CN1550728A - hot water generator - Google Patents

Abstract

In a hot water generating device (W), in particular a shower heater, which has a heating body (B) with at least two housing shapes (1, 2) connected to each other, these The housing shaped body defines a through passage (K1, K2) with a Venturi nozzle (V) integrally formed in the housing shaped body (1, 2).

Description

hot water generator

The invention relates to a hot water generating device according to the preamble of claim 1 .

A hot water generating device known in DE10130610A is provided with a Venturi nozzle communicated with the diaphragm box and located in the through channel; however, the formation and arrangement of the Venturi nozzle is not shown. In water heaters known from practice, especially in flow-through heaters, the Venturi nozzle is arranged as a separate injection-molded body in the through-channel. Due to the small size of the injection molded parts, the Venturi nozzles are formed very precisely, so that the connections and functional properties vary little within the construction series and do not require calibration. However, the production and assembly of the individual injection molded bodies requires considerable effort.

It is an object of the present invention to provide a hot water generating device of the above-mentioned prior art with impeccable connection and functional properties at low cost.

This object is achieved by the features of claim 1 .

Since the Venturi nozzle is directly integrally formed on the housing molding, the expense of separately manufacturing the Venturi nozzle and its subsequent installation is not required. The hot water generator is inexpensive to manufacture. Despite the manufacturing tolerances of the relatively large housing molded body, this connection and functional properties avoid alignment.

The one-piece Venturi nozzle can be conveniently defined in terms of forming technology by means of at least two nozzle subregions formed freely on the joining surfaces of the housing molded parts. The nozzle subregion is formed in the pressurized casting mold by means of the provided profile, ie the center part without movement. In this way, a precision resulting in better connection and functional properties is achieved in the Venturi nozzle with less manufacturing effort.

One nozzle subregion can be a Venturi recess opening into the contact surface, while the other nozzle subregion can be a covering surface of the Venturi recess, which preferably lies flush on the other contact surface. Since the housing molded body joins substantially perpendicularly to the contact surface, manufacturing tolerances or joining tolerances do not have a significantly greater influence on the connection and functional properties. The lateral offset between the coverage and the Venturi recess has essentially no negative effect.

The Venturi recess suitably has an approximately U-shaped cross-section with a greater U-depth relative to the U-width between the recess walls. The relatively narrow but deep Venturi recess works not only to reduce the separation forces between the connected shell forms, but also to minimize the influence of tolerances in the direction perpendicular to the joint area of the shell forms . That is, the effect of these tolerances on the Venturi nozzle cross-section is significantly weaker on a percentage basis than if the Venturi concavity is wider but shallower.

In a preferred embodiment, a continuous sealing bridge is provided at least on the outside on at least one contact surface and along the contour of the Venturi recess. The sealing bridges are erected on the contact surfaces prior to joining the housing molded parts and are plastically deformed during the joining to form the seal. In this method, firstly, a good seal is formed in the flow area of the Venturi nozzle, which blocks leaks affecting switching and function.

In order to be able to connect the housing parts to each other by welding in a preferred embodiment, it is therefore suitable to provide the projecting welding flanges in the housing parts in alignment with one another before the face-to-face connection of the contact surfaces , and in particular, discharge offset recesses are provided on both sides along the through passage. During welding, the extruded material flows into the discharge offset recess without reaching the through channel and/or the Venturi nozzle, and the contact surfaces in the area of the Venturi nozzle are thus pressed against each other by dynamic engagement together so that the sealing bridge can reliably produce the required sealing effect.

In a preferred embodiment, the connected housing molded parts have a diaphragm box in the vicinity of the Venturi nozzle. The diaphragm cartridge can be realized in one piece in the housing molded body and communicate with the Venturi nozzle and/or the through-channel at the pressure transmission channel. Each pressure transmission channel is also expediently integrated directly in at least one housing molded body in shaping technology. In this case, it is advantageous when each pressure transmission channel is delimited by means of channel sections formed in each housing shaped body aligned with one another, similarly to the formation of a Venturi nozzle. Forming the Venturi nozzle and the equalizing channel directly in one piece in the housing molded body can lead to a reduction in the production and installation costs of the hot water generating device.

It is advantageous in terms of forming technology if the channel section of the pressure transmission channel connecting the Venturi nozzle to the diaphragm cartridge is formed on the recessed wall with an opening into the contact surface. The opening forms a stationary profile in the extrusion die, which ensures high precision and good forming reliability.

In order to avoid damage to the leakage in the area of the equalizing channel, the channel part along the contact surface therefore provides a lateral continuous sealing bridge, provided that it is only pressed together flat. Under joint tension, the sealing bridge is forced to seal closed by plastic deformation.

Embodiments of the subject matter of the invention are explained with reference to the figures. These drawings are:

Figure 1 shows a longitudinal sectional view of a through channel showing a part of a hot water generating device,

Fig. 2 is a partial sectional view taken along section II-II of Fig. 1 , and

FIG. 3 is a partial sectional view taken along section III-III of FIG. 1 .

The hot water generator W in FIG. 1 is, for example, a so-called shower heater for heating shower water. However, the structural principles to be explained below are also applicable to other types of continuous hot water generating devices.

The hot water generating device W of FIG. 1 comprises, as a main part, a heating body B in which further functional elements not shown in detail are installed and which, in the illustrated embodiment, is formed by two housings Pieces 1, 2 are formed together. Preferably, the housing moldings 1 , 2 are injection molded parts formed from plastic. The heating body B is covered by a hood H which is clearly visible from the side and is mounted on an upright wall by means of the lower rear side in FIG. 1 . The housing molded parts 1 , 2 are connected to each other by welding, and between these molded parts 1 , 2 delimit a through-channel K1 , K2 between an inlet and an outlet, not shown. The through direction is indicated by arrow 3 . Arranged in the through-channel K1 is a Venturi nozzle V which is formed directly in one piece in the two housing molded parts 1 , 2 by means of a forming process or injection molding.

A first nozzle part region 4 is formed in the housing molded part 1 , and a second nozzle part region 5 is formed in the other housing molded part 2 . As shown in FIG. 1 , the nozzle subregions 4 , 5 together define a Venturi nozzle V when the housing molded parts 1 , 2 are connected to one another.

Formed in one piece in the housing moldings 1, 2 is a diaphragm case D which communicates with the Venturi nozzle V and the through-passage K via a pressure transmission channel not shown in detail in FIG. differential pressure. The pressure-equalizing channels are for example integrally formed in the housing moldings 1, 2. In FIG. The other channel part 7 of the equalizing channel between the nozzle V and the diaphragm case D has an approximately U-shaped opening 8 in the nozzle part 4 . One or more heating elements T, for example tubular heating bodies, are mounted in the spaces K2 of the through-channel.

FIG. 2 shows the molded housing parts 1 , 2 in the region of the Venturi nozzle V before the molded housing parts 1 , 2 are connected together. The nozzle subregion 4 is a Venturi recess with a substantially U-shaped cross section and recessed walls 16 which extend substantially parallel to one another as far as the usual stripping slope and are connected to each other by a concave circle. Connects in the recessed bottom. The clear width b of the Venturi recess is significantly smaller than the depth h of U. Such a Venturi recess or nozzle subregion 4 opens into the contact surface 12 . A protruding continuous sealing bridge 13 is formed on the contact surface 12 along the contour of the Venturi recess. On the contact surface 12 , for example on both sides, a discharge deflection recess 15 adjoins a protruding welding bead 14 which, for example, is higher than the sealing bridge 13 relative to the contact surface 12 .

The other nozzle subregion 5 is, for example, a flat cover surface which is formed flush, for example, in the contact surface 9 of the housing molded part 1 . Also adjoining on both sides of the contact surface 9 is a discharge deflection recess 10 and a welding bead 11 , which protrudes above the contact surface 9 .

To connect the housing parts 1 , 2 , the housing parts 1 , 2 of the heating body B are pressed against each other until the contact surfaces 9 , 12 contact each other or at least the sealing bridge 13 seals against the contact surface 9 . Prior to plastic deformation ( FIG. 3 ), at least the welding flanges 11 , 14 are heated until plasticized. The discharged material flows from the welding flanges 14 , 11 into the offset recesses 15 , 10 .

FIG. 3 shows how the sealing bridge 13 performs its sealing function and, for example, presses the contact surfaces 9 , 12 tightly against one another. The opening 8 of the channel part 7 of the pressure transmission channel, the other channel part of which is the contact surface 9 in the channel region shown, opens into the contact surface 12 in the recessed wall 16 in FIG. 3 . Along the channel part 7 in the contact surface 12 or 9 is provided a continuous convex sealing bridge, such as the sealing bridge 13 in 2, which is plastically deformed after the housing molded parts are connected, and then this sealing function Leakage of the pressure transmission passage can be prevented.

The preferably planar contact surface 5 forming one of the nozzle subregions 5 of the Venturi nozzle V in FIG. 2 does not have to be flush with the contact surface 9 . For example, it protrudes opposite to this contact surface in order to form a reliable sealing action with the sealing bridge 13 .

In the case of the manufacturing and joining tolerances which are necessary in the relatively large housing molded parts 1 , 2 , the nozzle part region 4 which is formed as a relatively narrow but deep Venturi recess in contrast to the flat surface 5 or contact surface 9 provides a double advantage during interaction. In particular, the cross-sectional size of the Venturi nozzle V has absolutely no influence if it fills the housing molded body 1 , 2 of FIG. 3 in the direction of the contact surfaces 9 , 12 . If the contact pressure between the contact surfaces 9, 12 or the size of the tolerance between them varies in the construction series due to the tolerance, then this means that the influence on the cross-sectional size of the Venturi nozzle V is negligible because the smaller The deep U-shaped cross-section (width b) makes the change in cross-section of the narrower Venturi nozzle hardly noticeable. Basically, it can be said that the nozzle subregion 4 is so narrow and deep and can also be rounded that tolerances and flow ratios in the Venturi nozzle have a non-negligible influence on the connection and functional properties of the device. At least the widest laminar flow ratio exists in the Venturi cross-section.

The production and connection method of the heating body B results in the fact that the Venturi nozzle is divided into two nozzle subregions 4 , 5 , in fact into contact surfaces 9 , 12 . Firstly, the welded connection of the two housing molded parts 1 , 2 forms a functional Venturi nozzle. The formation of the nozzle part area with the fixed surface of the pressurized casting mold produces the necessary precision and waveform fidelity and connection and functional properties, which eliminates the need for calibration. Not only is the sealing bridge forced to seal, wherein the sealing bridge prevents leakage outflow in the region of the Venturi nozzle in a parallel direction, but it also prevents the sensitive region of the Venturi nozzle from remaining covered until the material is discharged during welding.

Claims (10)

1. A hot water generating device (W), in particular a shower heater, with a heating body (B) having at least two housing shapes (1, 2) connected to each other, these The housing moldings delimit between them at least one through channel (K1, K2) with a Venturi nozzle (V), characterized in that the Venturi nozzle (V) is integrally formed on the housing molding (1, 2) in. 2. The hot water generating device according to claim 1, characterized in that the Venturi nozzle (V) is formed on the mutual contact surfaces (9, 12) of the housing moldings (1, 2) by means of at least two free standing ) on the nozzle part area (4, 5) to define. 3. The hot water generating device according to claim 2, characterized in that one nozzle sub-area (4) opens into a Venturi recess in the contact surface (12) and the other nozzle sub-area (5) is A covering surface of the Venturi recess which preferably lies flush on the other contact surface (9). 4. The hot water generating device as claimed in claim 3, characterized in that the Venturi recess as a nozzle part area (4) has an approximately U-shaped cross-section, with respect to the U width between the recess walls (16) (b), the cross-section has a greater U-depth (h). 5. The hot water generating device as claimed in at least one of the preceding claims, characterized in that the housing shaped body (1, 2) is an injection molded plastic part and the nozzle subregion (4, 5) is formed in a non-movable The molded surface is pressurized and cast in a film mold. 6. The hot water generating device as claimed in at least one of the preceding claims, characterized in that at least one contact surface (9, 12) and along the profile of the Venturi recess are provided with continuous sealing bridges (13) at least on the outside ), the sealing bridge protrudes on the contact surface (9, 12) before joining the housing moldings (1, 2), and after joining the housing moldings (1, 2), plastically deforms the sealing bridge to The opposite contact surfaces form a seal. 7. The hot water generating device as claimed in at least one of the preceding claims, characterized in that in the housing shaped parts (1, 2) which are not joined together, an overlapping alignment and, relative to the contact surfaces (9, 12) are provided Protruding welding flanges (11, 14) and in particular discharge offset recesses (15, 10) are provided. 8. The hot water generating device as claimed in at least one of the preceding claims, characterized in that the connected housing shaped bodies (1, 2) have a diaphragm case (D) in the vicinity of the Venturi nozzle (V), which diaphragm case In particular, it is integral and communicates with Venturi nozzles (V) and/or through passages (K1, K2) on pressure transmission channels, each pressure transmission channel being formed in each housing shaped body, mutually Aligned channel sections (7, 6) are defined. 9. The hot water generating device according to claim 8, characterized in that, the channel portion (7) of the pressure transmission channel from the Venturi nozzle (V) to the diaphragm box (D) is in the concave wall of the Venturi recess ( 16) has an opening (8) leading into the contact surface (12). 10. The hot water generating device according to claim 9, characterized in that, along at least the channel part (6, 7) of the pressure transmission channel from the Venturi nozzle (V) to the diaphragm case (D) there is provided a connecting Plastically deformable, protruding sealing bridges are the housing moldings (1, 2).