CN1237882A - Filters for containers equipped with boiling water and containers fitted with such filters - Google Patents

Abstract

This invention relates to a filter (7) for equipping a water boiling container (1), which is installed in the inlet (5) of the container. According to the invention, this filter (7) has a layer of activated carbon (11). The invention is particularly suitable for electric kettles.

Description

Filters for containers equipped with boiling water and containers fitted with such filters

The invention relates to a filter for equipping containers for boiling water, in particular kettles, and for fitting in the filling opening of such containers.

Such a filter has been described, for example, in the French patent application FR-2712474. This filter contains a softening substance, such as ion exchange resin, that traps calcium. On the other hand, it has been found that when tap water contains suspended solids such as organic matter, pesticides and chlorine, and thus exhibits high hardness, after boiling, the optical quality of the water will be greatly reduced, and even users will not want to use it. Boiled water for tea or coffee.

In order to eliminate this disadvantage, a mechanical filter has been proposed, the form of which has been described in the application for the French Utility Model Certificate, the purpose of which is to trap calcium and other impurities in hot water. But this filter is installed on the hot water channel outside the container, because of its structure, it will be blocked very quickly.

For this reason, the object of the present invention is to realize a filter that eliminates the aforementioned disadvantages.

According to the invention, the filter contains a layer of activated carbon.

Therefore, when cold water flows through this layer of activated carbon pad, not only the organic elements, pesticides and part of the chlorine are eliminated, but unexpectedly, its chemical balance is improved, so that clear water can be obtained after boiling.

In a preferred application of the invention, the filter is arranged in a cooking vessel whose walls are made of plastic, preferably polypropylene.

With the present invention, the problem of purification, which is exacerbated by the degradation or diffusion of the plastic components, is solved, the reduction of plastic degradation certainly contributing to a particularly satisfactory water.

Furthermore, the present invention, by way of example, is described below with reference to the accompanying drawings, in which:

Fig. 1 has shown the filter that is used for equipping electric kettle of the present invention.

Figure 2 shows the results of measurements of percent light transmission for untreated and water treated with filters of the present invention.

Fig. 3 shows another way of realizing the kettle equipped with the filter of the present invention.

The container 1 for boiling water shown in FIG. 1 is, for example, a kettle with a main body 2 . The bottom 3 of the main body 2 is equipped with a heating device 4 such as an immersion resistance, while its filling opening 5 is equipped with a support 6 in which a filter 7 is installed.

The immersion resistor is tubular, chrome-coated, and provides, for example, 2200 watts of power at 240 volts, thus quickly boiling 1.5 liters of water.

According to a preferred embodiment of the invention, as shown, the support 6 is connected to a flange 8 which forms part of the cover of the filling opening 5 in order to provide a pouring spout 9 . The support 6 is roughly in the shape of a basin, with holes formed on its bottom 10, and there is a certain distance between the support 6 and the highest level N allowing liquid to be filled. The filter 7 is therefore always above the highest level N. This level is indicated by a dotted line in FIG. 1 and is generally indicated to the user by markings (not shown) on the inner wall of the body 2 .

According to the invention, the filter 7 comprises a layer 11 of activated carbon. The activated carbon is preferably treated with silver.

According to a preferred embodiment of the invention, the activated carbon layer 11 is enclosed in a bag 12 made of filter material, such as a so-called non-woven fabric. Thanks to this form of assembly, the bag 12 becomes detachable for easy replacement. Corresponding to a height of about 20 grams of activated carbon, the thickness of the activated carbon layer 11 is preferably about 10 mm. The activated carbon is, for example, in granular form or a nonwoven mat impregnated therewith.

In the shown example of carrying out the invention, the main body 2 of the container 1 is made of plastic, preferably polypropylene of the remarkable heat-resistant, talcum-free, antistatic and edible type. The polypropylene model used in the experiment shown in Fig. 2 is HOSTALEN PPU4080 ASTL of HOECHST Company.

As shown in Figure 2, the abscissa represents the liters of water to be boiled, and the ordinate represents the percentage of light transmission measured with a spectrophotometer HACH at a wavelength of 530 nm. This value is expressed as a percentage of the ratio of the transmitted light amount to a reference light amount (a light transmittance of 100% is equivalent to water before boiling). Thus, unlike the prior art, treated water in contact with the aforementioned polypropylene material remains transparent, whereas untreated water is cloudy.

In Fig. 2, the dividing line between turbid water (below 90%T) and clear water (above 90%T) is indicated by a dotted line.

The hardness of the water used for this experiment was about 40TH.

Curve A represents the results of a visual measurement of boiling water in a kettle without a filter, while curve B shows the results of a measurement of boiling water in a kettle made of polypropylene and equipped with a filter according to the invention.

As shown in the figure, according to curve A, for the case from 10 liters to 30 liters, the light transmittance is substantially between 80%T and 87%T, thus exhibiting a cloudy appearance. On the contrary, after the cold water has passed through the filter 7, it is found that on the curve B the optically clear quality of the water is higher than that of the curve A and, on average, can be regarded as clear water. This result is particularly remarkable for kettles with a main body made of polypropylene, especially HOSTALEN PPU 4080ASTL from the company HOECHST.

Numerous experiments with water of different hardness confirmed the results obtained above, the following explanation can now be given is unexpected: the filtration of cold water on activated carbon is to increase the calcium carbonate product solubility (KS) value, thus delaying the precipitation of calcium carbonate to a temperature higher than that reached by the water in the boiling kettle at atmospheric pressure.

Thus, when the user fills the container 1 with water of high hardness from cold tap water, the water flows through the entire extent of the filter 7, undergoes mechanical filtration and changes in chemical equilibrium, and then flows out along the perforated bottom 10 of the support 6.

After this water boils, because there is not any obstacle that water flows, the user can pour out water through pouring spout 9, until container 1 is emptied. This hot water is in clear form and can therefore be used for brewing.

According to another mode of realizing the present invention shown in Figure 3, container 15 comprises a main body 16 made of plastics, such as polypropylene, preferably HOSTALEN PPU 4080 ASTL of HOECHST company. This main body bottom 17 has a heating device 18, and has a pouring mouth 19 that filter 20 is housed and a lid 21, and this lid covers a part of this entrance, and arranges pouring spout 22.

The filter 20 comprises a layer of activated carbon 23 enclosed in a bag 24 of filter material so that the bag forms a removable core and is fixed by a support 25 at the highest level (N ), this horizontal plane is represented by a dotted line, marked on the inner wall of the main body 16 with a mark 26 .

The seat 25 is accommodated in the cover 21, and is now integral with this cover, forming a basin-like shape, the bottom 27 of which has a restricted flow opening 28.

By means of this restricted flow opening 28, which in this example is a circular hole with a diameter of approximately 1.5 cm, and the corresponding circular bottom 27 with a diameter of 8 cm, by minimizing the passage of hot water vapor to the layer of activated carbon 23, And thus steam is easily flowed away along the pouring spout 22, and the reliability of the active carbon layer 23 that is processed with silver or not processed with silver can be guaranteed.

In order to meet the unimpeded flow of cold water through the filter 20, and in order to prevent steam from passing through the support 25, the bottom 27 additionally includes a plurality of ribs 29, on which the bag 24 of the filter 20 is installed, and it extends to The top of the restricted opening 28 thus forms a space between the bag and the bottom of the basin.

In order to protect the aesthetics of the kettle and to ensure a certain hygiene of the filter 20 , the basin-shaped support 25 is provided with a cover 30 which is hinged at 31 on the lid 21 .

The last embodiment used is similar to the one described above, using a body made of polypropylene "HOSTALEN", after passing cold water through activated carbon treated with silver or not, hot water with a clear appearance is obtained, the support 25 The improvement in manufacture can ensure the reliability of the filter 20 and make it less prone to deformation after long-term use.

Claims (13)

1. be used for equipment container (1) usefulness that boils water, be installed in the filter in mouthful (5) of pouring into of container, it is characterized in that: it includes one deck activated carbon (11).

2. according to the described filter of claim 1, it is characterized in that: this activated carbon was handled by silver.

3. according to claim 1 or 2 described filters, it is characterized in that: this layer activated carbon (11) is to be encapsulated in the sack of being made by filtering material 11.

4. according to the described filter of claim 3, it is characterized in that: the thickness of this layer activated carbon (11), the height corresponding to about 20 gram activated carbon is about 10mm.

5. according to the described filter of claim 4, it is characterized in that: this sack (11) by bearing be fixed on highest level face (N) that infusion containers allows above.

6. according to the described filter of claim 5, it is characterized in that: this bearing (6) be shaped as common box-like, its bottom (10) go up form porose, be positioned at highest level face (N) above.

7. according to the described container that boils water (1) that is equipped with filter (7) of each claim of front, it is characterized in that: described main body (2) is made by plastics.

8. according to the described container of claim 7, it is characterized in that: these plastics are polypropylene.

9. according to the described container of claim 8, it is characterized in that: this polypropylene has significant hear resistance, does not add talcum powder, and is antistatic and be the polypropylene of edibility.

10. according to the described container of claim 9, it is characterized in that: this polyacrylic model is HOSTALEN PPU 4080 ASTL.

11. the container that boils water of kettle and so on, it includes main body (16), this main body is made by polypropylene one class plastics, a heater (18) is arranged at its bottom (17), this main body has mouthful (19) and the lid (21) of pouring into that filter (20) is housed, this pours into this cap covers the part of mouth and is mounted with pouring nozzle (22), this Vessel for heating water is characterised in that: filter (20) comprises one deck activated carbon, it is encapsulated in the sack (24) that filtering material makes, and by bearing (25) be fixed on highest level face (N) that infusion containers allows above, this bearing is contained in the lid (21), be basin shape, its bottom (27) has one to flow out restricted opening (28).

12. according to the described container of claim 11, it is characterized in that: this bottom (27) includes a plurality of ribs (29), the sack (24) of filter (20) is installed on these ribs, and it is stretched over the top of this restricted opening (28) and forms a space between this sack and this bottom.

13., it is characterized in that: a cover is housed on the described basin shape bearing (25) according to claim 11 or 12 described containers.

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