DE9004530U1 - Sales counter - Google Patents

Description

DESCRIPTION Sales counter

The hearing concerns "buyer's items" with the characteristics in the generic term of the main claim.

Such sales counters with a heated interior are used, for example, in butchers' shops or snack bars. Hot goods such as meat loaf, schnitzel or the like are offered in the counter. The temperature prevailing in the interior of the counter creates a

-r'^es problem with the drying out of the goods. In order to counteract this, humidification devices are used in practice. However, these usually direct a cool water mist or steam onto the goods, which does not reduce the drying effect but actually increases it due to the temperature differences.

A sales counter is known from DE-OS 32 02 012 in which a water tray is arranged under the product support arch. The water is heated by heat radiators in the counter roof and is supposed to evaporate. It rises through a perforated product support surface and is supposed to moisten the products laid out on it. The evaporated water is not accelerated.

From US-PS 3 145 03? it is also known to arrange a container filled with water under the goods carrier of a sales counter. The walls of this container are heated by the circulating hot air flow; by Nusson

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heated so that water evaporates from the container and rises without further acceleration to a goods support floor for humidification purposes.

DE- P 40 259 shows a thermally insulated steam distribution pipe with a white coating for the interior of a counter. FR-OS 2 637 479 deals generally with a heated counter, but without humidification. The article "Condensate-free air humidification using modular steam distribution systems" from "Die Kälte und Klimatechnik ¹ ', 12/1978, shows a steam distribution system that deals with the removal of condensate. The steam is supplied from a saturated steam line and is not accelerated additionally on its way to the distribution pipe.

It is therefore the object of the present invention to show a possibility for the effective and economical moistening of the goods.

The invention solves these problems with the features in the main claim.

The steam generator produces hot steam that is at least the same temperature or even warmer than the goods on display. This causes the steam to condense on the goods and prevents them from drying out and the associated loss of weight and value.

In order to ensure even humidification, the steam fed into the counter interior via a supply line is accelerated by fast-flowing air. This air reaches the...

(I/oH.Setting with page 2 of the original description)

At first it: corner. The steam flows into the counter interior at a higher speed and is distributed better and more evenly there. This also covers areas of the goods that are in the direction of the flow and prevents them from drying out. The inflow speed of the steam is so high due to the air acceleration that convection effects are also effectively counteracted.

The injector pipe can end at any point along the supply line, for example at the distributor pipe inside the counter. However, the best results are achieved when the injector pipe extends into a feed pipe connected to the steam generator. This accelerates the steam immediately behind the outlet part on the steam generator and reaches the distributor pipe at a high speed. Speed differences at the outlet on the distributor pipe and inside the counter are largely avoided in this way.

Steam acceleration works according to the physical principle of a water jet pump, whereby two effects are achieved. Steam particles are entrained and accelerated by the air jet shooting into the steam at high speed. This creates an increased delivery pressure before the injector pipe opens. In the steam area around and behind the injector pipe opening, however, a negative pressure is created, which increases the steam flow out of the steam generator.

In order to make these physical effects particularly effective, it is recommended to equip the feed pipe with a bend and to let the injector pipe protrude through the bend. The excess pressure is then created in the following pipe section, which should run as horizontally as possible and then open centrally into the distributor pipe. The bend in turn connects to an overhead

Outlet opening of the steam generator so that the negative pressure created in the debris area develops an optimal conveying effect,

The preferred embodiment results in a compact size combined with relatively low construction and installation costs. The desired humidification effect is thus achieved in a particularly economical manner.

Due to the compact design, most parts of the humidification system can be arranged on the back wall of the sales counter and are hidden under the worktop. They do not cause any disruption here and can also be retrofitted to existing hot counters.

The acceleration of the steam by the blown-in air also makes it possible to use a cost-effective so-called pressureless steam generator. This produces little or no excess pressure for independent steam delivery thanks to a flexible housing. The inherent pressure is just high enough for the steam to reach the top of the feed pipe and only then does it experience the necessary delivery pressure through the blown-in air. In this way, the steam generator is also particularly safe to operate and avoid accidents.

The invention is shown schematically in the figures, for example. In detail:

Fig. 1: a cross-section through a sales counter with a heated interior and a humidification device,

Fig. 2: an enlarged detailed view of the steam generator and the blower with injector pipe and

Fig. 3: a cross-section through the feed pipe according to section line III - III of Fig. 2.

Fig. 1 shows a cross-section of a sales counter (1) with a heated counter interior (19) in which warm food is offered on a goods support shelf (2). The goods support shelf (2) is equipped with a heater (18). The goods are heated from above by heat radiators (17) on the dome of the glass top.

In order to prevent the food from drying out, a humidification device (3) is provided, which consists of a steam generator (4) with a supply line (6) and a blower (10) with an injector pipe (11). The steam generator (4) produces hot steam, which is fed via the supply line (6) into the counter interior (19) and humidifies the goods there. The steam has a temperature of its own, which is at least equal to, but preferably higher than, the temperature of the goods.

The steam generator (4) is designed as a so-called pressureless steam generator and has a flexible housing (5). The fresh water fed to the steam generator through an external line (not shown) is measured by two electrodes (also not shown).

"rheated. The heat transfer takes place through struni'ibergony in the water. The steam generator (4) is aligned vfi tik-il and has a central outlet opening on the top (22) through which the steam exits.

As shown in Fig. 2, the supply line (6) consists of a feed pipe (7) and a distributor pipe (8) with nozzles (9) extending into the counter interior (19). The feed pipe (7) has a bend (20) which is connected at one end to the outlet opening (22) of the steam generator (4). At the other end, the bend (20), which is bent by approx. 90°, merges into a horizontal pipe section (21). If necessary, the pipe section (21) has another bend below. The pipe section (21) is in turn connected centrally to the distributor pipe (8) at the end. The steam supplied in this way at a central location is distributed evenly on both sides in the distribution pipe (8) extending along the sales counter (1) and enters the interior of the counter (19) with even pressure via the nozzles (9).

The blower (10) with the injector pipe (11) is provided for conveying and accelerating the steam in the supply line section (6). The injector pipe (11) extends through the bend (20) and opens into the horizontal and straight pipe section (21). The injector pipe (11) has a smaller diameter than the pipe section (11) and extends in a central position along the length of the pipe.

The injector pipe (11) is, on the one hand, glazed at the point of passage in the outer wall of the elbow (20) and sealed against steam leakage. On the other hand, the injector pipe (11) is guided in a central support ring (12) which is held to the sides of the feed pipe (7) by three radial struts (13). Fig. 3 shows this arrangement. The support ring (12) is located at the transition of the elbow (20) into the horizontal and straight

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Pipe section (2.1). The front end of the injector pipe (11) protrudes a little beyond the support pipe (12) and into the pipe section (21).

Outside air is sucked in via the blower (10) and, after being compressed by a nozzle, blown through the injector pipe (11) into the feed pipe (7). The air blown in flows at high speed and shoots as a jet into the steam in the pipe section (21). The air jet conveys and accelerates the steam through the feed line section (6) according to the physical principle of a water jet pump. In the mouth area and behind the injector pipe (11), a negative pressure is created that sucks the steam out of the steam generator (4). Overpressure is created in front of the injector pipe (11), which forces the steam through the feed pipe (7) and the distributor pipe (8) and allows it to flow through the nozzles (9) at an increased speed into the counter interior (19).

The jet effect of the air and the resulting steam acceleration are chosen to be so high that the steam flows into the counter interior (19) at such a high speed that it covers the entire floor area and the displayed goods and reaches the glass pane facing the customer. The speed is also so high that convection caused by the ambient temperature in the counter interior (19) and the overhead heat radiators (17) are overcome, which try to divert the steam and air currents upwards.

The steam generator (4) with the elbow (20) and the blower (10) with the injector pipe (11) are housed as a compact unit in a common housing and mounted on the operator side (15) on the rear wall (14) of the sales counter (1). They are located below the worktop (16) which pushes the parts upwards.

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covers. The pipe section (21) protrudes through the heat-insulated wall of the counter body (23). The distribution pipe (8) is arranged at an angle between the inwardly projecting worktop (16) and the aforementioned body wall.

Modifications to the embodiment shown are possible in various respects. The injector pipe can also protrude through the bend (20) at another point, for example from an angle from the outside, into the feed pipe ₍ 7) . A connection is also possible in the area of the distributor pipe (8), with the injector pipe (11) extending, for example, from the front side, along the longitudinal axis of the pipe. Other constructions can also be used as steam generators (4), for example by generating a high internal pressure through a rigid housing, which allows the steam to escape at a higher speed. The air jet can then further increase its conveying speed. Normal electric motor-driven fans can be used as blowers. In addition, however, all devices can be used which can accelerate and compress air and convey it through the injector pipe (11). This can also be a connected compressed air line, for example.

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•&igr;&igr; I : &igr; -i · Bi ·■ PIECE OF ITEMS 1 Sales counter, hot counter 2 Goods support floor 3 Humidification device 4 Steam generator 5 Housing 6 Suction line 7 Feed pipe 8th Distribution pipe 9 Nozzles 10 fan 11 Injector tube 12 Stßtaring 13 strut 14 Back wall 15 Operating instructions 16 Worktop 17 Heat lamps Heating 19 Counter interior 20 Manifold 21 Pipe section 22 Outlet opening 23 Counter body

Claims (8)

I I I &bgr; 1 I I I CLAIMS 1.) Sales counter with a heated interior and a humidification device, characterized in that the humidification device (3) has a steam generator (4) producing hot steam with a supply line (6) leading into the interior of the counter (19) and a blower (10) with an injector pipe (11) , the injector pipe (11) opening into the supply line (6). 2.) Sales counter according to claim 1, characterized in that the injector pipe (11) projects into a feed pipe (7) connected to the steam generator (4). 3.) Sales counter according to claim 2, characterized in that the feed pipe (7) has a bend (20), whereby the injector pipe (11) protrudes through the bend (20) and opens centrally and flush into the closing pipe section (21). 4.) Sales counter according to claim 3, characterized in that the injector tube (11) is guided in a central support ring (12) which is mounted by struts (13) in the tube section (21). 5.) Sales counter according to claim 3 or 4, characterized in that the pipe section (21) extends horizontally and is connected to a distributor pipe (8) in the counter interior (19). 6.) Sales counter according to claim 1 or one of the following, characterized in that the steam generator (4) has an outlet opening (22) on the upper side, to which the feed pipe (7) is connected. 7.) Sales counter according to claim 1 or one of the following, characterized in that the damper (4) and the blower (10) αιδιανα (αιδιανα Rear wall (14) of the sales counter (1) are arranged under the worktop (16). 8.) Sales counter according to claim 1 or one of the following, characterized in that the steam generator (4) is designed as a pressureless steam generator with a flexible housing (5).